APA (7th ed.) Citation

Gaudaen, G., & Křupka, V. (1964). Ex Libris Vaclav Křupka.

Chicago Style (17th ed.) Citation

Gaudaen, Gerard, and Vaclav Křupka. Ex Libris Vaclav Křupka. [S. l, 1964.

MLA (9th ed.) Citation

Gaudaen, Gerard, and Vaclav Křupka. Ex Libris Vaclav Křupka. 1964.

Warning: These citations may not always be 100% accurate.