APA (7th ed.) Citation

Witopil, F., & Grünfeld, J. (1925). Ex Libris Josef Grünfeld.

Chicago Style (17th ed.) Citation

Witopil, Franz, and Josef Grünfeld. Ex Libris Josef Grünfeld. [S.l, 1925.

MLA (9th ed.) Citation

Witopil, Franz, and Josef Grünfeld. Ex Libris Josef Grünfeld. 1925.

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