APA (7th ed.) Citation

Krzywka, R. (1959). Ex Libris RK. [Ryszard Krzywka].

Chicago Style (17th ed.) Citation

Krzywka, Ryszard. Ex Libris RK. [Ryszard Krzywka]. [S.l.], 1959.

MLA (9th ed.) Citation

Krzywka, Ryszard. Ex Libris RK. [Ryszard Krzywka]. 1959.

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