APA (7th ed.) Citation

Schmidt, E., & Kempa, A. (1973). Ex Libris Andrzej Kempa.

Chicago Style (17th ed.) Citation

Schmidt, Eugen, and Andrzej Kempa. Ex Libris Andrzej Kempa. Leipzig, 1973.

MLA (9th ed.) Citation

Schmidt, Eugen, and Andrzej Kempa. Ex Libris Andrzej Kempa. 1973.

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