APA (7th ed.) Citation

Krzywka, R., & Serwiński, P. (1959). Ex Libris SP.

Chicago Style (17th ed.) Citation

Krzywka, Ryszard, and Piotr Serwiński. Ex Libris SP. [S. l.], 1959.

MLA (9th ed.) Citation

Krzywka, Ryszard, and Piotr Serwiński. Ex Libris SP. 1959.

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