KOUMAR, J.(2024). Everyday Life in the Time of Cholera. Paris of 1832 from the Perspective of the Hungarian Count Rudolf Apponyi. Historical Journal, Volume 72, Issue 3, p. 459-478.

KOUMAR, J.(2024). The Ethics of Sexual Passions in the Work of Frederick II the Great. The Philosophical Journal, Volume 72, Issue 3, p. 481-498.

KOUMAR, J.(2024). The Nobility of the Danube Monarchy and the Bavarian Order of the Knights of St. George: The Case of Eduard III Collalto e San Salvatore. Theatrum historiae, Volume 2024, Issue 34, p. 43-60.

KOUMAR, J.(2023). Real and False Fame in Frederick the Great’s Discourses on Libels and Satirist. Filosofie dnes, Volume 15, Issue 1, p. 3-22.

KOUMAR, J.(2023). Bulgarian Queen Eleonore in Memoires of Marie Therese Collalto. Historica, Volume 14, Issue 2, p. 114–133.

KOUMAR, J.(2023). Tourism of Aristocracy in the Second Half of the 19th Century. The Case of Emanuel Collalto e San Salvatore. Modern History, Volume 31, Issue 1, p. 9–34.

KOUMAR, J.(2022). Three Nuptial Publications Celebrating Italian Unions of the House of Apponyi in Early 19th Century. Historical Journal, Volume 70, Issue 5, p. 949–965.

KOUMAR, J.(2022). The Moral Obligations of the Soldier. Karl Gustav Hohenlohe-Langenburg's "De devoirs militaires". History-Issues-Problems, Volume 2022(14), Issue 2, p. 128-138.

KOUMAR, J.(2022). Morganatic Marriage of the Aristocrat in the Second Half of the 19th Century as a Social Deviation: The Instance of Emanuel Collalto e San Salvatore. Historical Sociology, Volume 2022, Issue 2, p. 105-119.

KOUMAR, J.(2022). Birthplace of Jestav Bricks. The Story of the Collalto Brickyard in Okříšky 1922-1942. Vlastivědný sborník vysočiny. Oddíl věd společenských, volume XXI, issue 2018, p. 25-36.

KOUMAR, J.(2022). Quotidian Life of Aristocracy in the First Czechoslovak Republic. The Case of the House of Collalto e San Salvatore. West Bohemian Historical Review, Volume XII, Issue 1, p. 19-45.

KOUMAR, J.(2021). Game Management and Hunting on the Collalto Estates in Czechoslovakia (1918-1945). Prameny a studie, issue 69, p. 81–94.

KOUMAR, J.(2021). Aristocratic Widowhood in the Second Half of 19th Century. The Case of Carolina Collalto e San Salvatore Née Apponyi. Historical Journal, Volume 69, Issue 5, p. 863–887.

KOUMAR, J., SCHIMMER, J., ZAŽÍMAL, D. (2021). Computer Literacy Improvement in a Health-Care Facility. The Case Study of Hospital Jihlava 2020 – 2021. Individual and Society, volume 24, issue 2, p. 1-18.

KOUMAR, J. (2020). Rejectionist and Anatinatalist Frames of Mind in Work of Otokar Březina and Anna Pammrová. Kuděj, volume 20, issue 2, p. 38-52.

KOUMAR, J. (2019). Emanuel Collalto e San Salvatore. Three perspectives on the life of the “last man of the old regime in Austria”. Modern History, volume 27, issue 2, p. 31-53.

KOUMAR, J. (2019). The Last Princes of the House of Collalto e San Salvatore in Moravia. Historical Journal, volume 67, issue 4, p. 633-657.

KOUMAR, J. (2019). Viennese and Moravian Settlements of Emanuel Joseph 4th Prince Collalto e San Salvatore. Historica, volume 10, issue 1, p. 33-47.

KOUMAR, J. (2019). Five Approaches to Ethics of Sexuality? The Consequences of the Asymmetric Argument by David Benatar for the Ethics of Sexual Behaviour. Philosophy Today, volume 10, issue 1, p. 64–81.

KOUMAR, J. (2018). Confiscation of the Czech-Jew Possession in the Post-war Czechoslovakia Through Example of the Castle and Manor Farm Estate Puklice. Historical Sociology, volume 2018, issue 2, p. 83-99.

KOUMAR, J. (2017). Unnatural as a Category in Sexual Ethics. Man and the Society, volume 20, issue 3, p. 60-69.

KOUMAR, J. (2012). The Church and Homosexuality. The Normative and Personal Concepts of Christian Clergymen. Urban People, volume 14, number 3., p. 529 -562.

KOUMAR, J. (2020). Consequences of Etiquette for Social Relations In: Reviewed Proceeding of the International Masaryk Conference for PhD. Students and Young Researchers, Hradec Králové, MAGNANIMITAS, p. 602-607, ISBN 978-80-87952-33-7.

KOUMAR, J. (2020). Antinatalism and Sexual Ethics, pp. 149-165 in: LOCHMANOVÁ, K. (ed.). History of Antinatalism. How Philosophy Has Challenged the Question of Procreation. Kindle Direct Publishing. ISBN: 979-8645624255.

KOUMAR, J. (2018). Ethics of Sexuality: the Qualitative Research of the Moral Values of EU Citizens. In: Reviewed Proceeding of the Interdisciplinary Scientific International Conference QUAERE, pp. 885-889, Hradec Králové, MAGNANIMITAS, ISBN 978-80-87952-26-9.

KOUMAR, J. (2017). Approaches and Tendencies in the Current Ethics of Sexuality. In: Reviewed Proceeding of the International Masaryk Conference for PhD. Students and Young Researchers, Hradec Králové, MAGANIMITAS, p. 959-964, ISBN 978-80-87952-22-1.

KOUMAR, J. (2020). Question of the Month. Does History Progress? If So to What?. Philosophy Now, Volume 2020/21, Issue 141, p. 63.

KOUMAR, J. (2019). Stories of an aristocratic family. The Collalto e San Salvatore family and Czechoslovakia. História, volume 18, issue 5, p. 13-18.

KOUMAR, J. (2019). „The Land of Suntanned People“. Abyssinian Journey of Emanuel Collalto e San Salvatore in 1908. História, volume 18, issue 3, p. 26-32.

KOUMAR, J. (2017). The Relation of People to Bad Smells in Their Everyday Lives. From Middle-Ages to Present Days. Obscura, volume 4, issue 5, p. 52-56.

KOUMAR, J. (2024). Review: Jaromír Patočka – Miloš Hořejš, Hieronymus Colloredo-Mannsfeld. The Life Journey of an Austro-Hungarian Naval Officer. History-Issues-Problems, volume 16, issue 1, p. 122-124,

KOUMAR, J. (2023). Review: Avi Lifschitz (ed.), Frederick the Great’s Philosophical Writings. Philosophy in Review, volume 43, issue 2, p. 9-11,

KOUMAR, J. (2022). Review: Annalisa Coliva and Duncan Pritchard, Skepticism. Philosophy in Review, volume 42, issue 3, p. 4-6,

KOUMAR, J. (2021). Review: Damon Young. On Getting Off: Sex and Philosophy. Philosophy in Review, volume 41, issue 3, p. 224-226

KOUMAR, J. (2021). The Fruits of Manipulative Argumentation. Jiří Fuchs: Illusion of Ethical Relativists. Systematic Course of Ethics. Philosophical Journal, volume 69, issue 1, p. 178-181.

KOUMAR, J. (2019). Review: Ryan Patrick Hanley. Love’s Enlightenment: Rethinking Charity in Modernity. Philosophy in Review, volume 39, issue 2, p. 75-76.

KOUMAR, J. (2018). Review: Ladislav Špaček, Etiquette. Modern Etiquette for Everybody. Cesky lid, volume 105, issue 1, p. 120-122.

KOUMAR, J. (2018). Review: John Mercer: Gay Pornography. Representations of Sexuality and Masculinity. Urban People, volume 20, issue 1, p. 197-201.

KOUMAR, J. (2018). Review: Christopher Arroyo. Kant’s Ethics and the Same-Sex Marriage Debate: An Introduction. Philosophy in Review, volume 38, issue 2, p. 45-46.

KOUMAR, J. (2024). House of Collalto in the 20th century. Municipal Library in Brtnice, 10. 10. 2024. Record: youtube video

KOUMAR, J. (2024). House of Collalto in Moravia in the 19th and 20th Century. Castle Brtnice, Brtnice, 23. 6. 2024. Record: youtube video

KOUMAR, J. (2023). Travelling of Aristocracy and the Birth of Tourism. Museum Trencin, Trencin, Slovakia, 11. 5. 2023. Record: youtube video

KOUMAR, J. (2022). House of Collalto and the Bohemian-Moravian Highlands. Jihlavská medicínská akademie JIMEA, Hospital Jihlava 7. 12. 2022