APA (7th ed.) Citation

Krzywka, R., & Hilberg, T. (1961). Ex Libris Torben Hilberg.

Chicago Style (17th ed.) Citation

Krzywka, Ryszard, and Torben Hilberg. Ex Libris Torben Hilberg. [S.l, 1961.

MLA (9th ed.) Citation

Krzywka, Ryszard, and Torben Hilberg. Ex Libris Torben Hilberg. 1961.

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