APA (7th ed.) Citation

Ferstl, J., & Geyer, M. (1907). Ex libris martha geyer.

Chicago Style (17th ed.) Citation

Ferstl, Joseph, and Martha Geyer. Ex Libris Martha Geyer. [S. l.], 1907.

MLA (9th ed.) Citation

Ferstl, Joseph, and Martha Geyer. Ex Libris Martha Geyer. 1907.

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