APA (7th ed.) Citation

Brudnicki, M., & Hniedziewicz, P. (1941). Ex Libris Piotra Hniedziewicza.

Chicago Style (17th ed.) Citation

Brudnicki, Marek, and Piotr Hniedziewicz. Ex Libris Piotra Hniedziewicza. [S.l, 1941.

MLA (9th ed.) Citation

Brudnicki, Marek, and Piotr Hniedziewicz. Ex Libris Piotra Hniedziewicza. 1941.

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