APA (7th ed.) Citation

Krzywka, R., & Kowalski, N. (1959). Ex Libris N. Kowalskiego.

Chicago Style (17th ed.) Citation

Krzywka, Ryszard, and Norbert Kowalski. Ex Libris N. Kowalskiego. [S. l.], 1959.

MLA (9th ed.) Citation

Krzywka, Ryszard, and Norbert Kowalski. Ex Libris N. Kowalskiego. 1959.

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