APA (7th ed.) Citation

Mękicki, S., & Friedrich, J. (1942). Ex Libris Janina Friedrich.

Chicago Style (17th ed.) Citation

Mękicki, Stanisław, and Janina Friedrich. Ex Libris Janina Friedrich. 1942.

MLA (9th ed.) Citation

Mękicki, Stanisław, and Janina Friedrich. Ex Libris Janina Friedrich. 1942.

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