APA (7th ed.) Citation

Ritter, K., & Terfloth, H. A. (1921). Exlibris Hertha Terfloth.

Chicago Style (17th ed.) Citation

Ritter, Karl, and Hertha Augusta Terfloth. Exlibris Hertha Terfloth. 1921.

MLA (9th ed.) Citation

Ritter, Karl, and Hertha Augusta Terfloth. Exlibris Hertha Terfloth. 1921.

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