APA (7th ed.) Citation

Keppler, G. (1931). Familiengeschichte Keppler. Familiengeschichte Keppler.

Chicago Style (17th ed.) Citation

Keppler, Gustav. "Familiengeschichte Keppler." Familiengeschichte Keppler 1931.

MLA (9th ed.) Citation

Keppler, Gustav. "Familiengeschichte Keppler." Familiengeschichte Keppler, 1931.

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