APA (7th ed.) Citation

Kotrba, E., & Premstaller, O. (1960). Ottmar Premstaller Ex Libris.

Chicago Style (17th ed.) Citation

Kotrba, Emil, and Ottmar Premstaller. Ottmar Premstaller Ex Libris. [S. l.], 1960.

MLA (9th ed.) Citation

Kotrba, Emil, and Ottmar Premstaller. Ottmar Premstaller Ex Libris. 1960.

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