APA (7th ed.) Citation

Geiger, W., & Hellinger, O. (1945). Exlibris O. Hellinger.

Chicago Style (17th ed.) Citation

Geiger, Willi, and Oscar Hellinger. Exlibris O. Hellinger. 1945.

MLA (9th ed.) Citation

Geiger, Willi, and Oscar Hellinger. Exlibris O. Hellinger. 1945.

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