APA (7th ed.) Citation

Keller, O. (2019). Archivmaterialien zu Otto Keller, 1838-1927.

Chicago Style (17th ed.) Citation

Keller, Otto. Archivmaterialien Zu Otto Keller, 1838-1927. 2019.

MLA (8th ed.) Citation

Keller, Otto. Archivmaterialien Zu Otto Keller, 1838-1927. 2019.

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