APA (7th ed.) Citation

Keller, E. (2019). Archivmaterialien zu Erwin Keller.

Chicago Style (17th ed.) Citation

Keller, Erwin. Archivmaterialien Zu Erwin Keller. 2019.

MLA (8th ed.) Citation

Keller, Erwin. Archivmaterialien Zu Erwin Keller. 2019.

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