APA (7th ed.) Citation

Keefer, E. Archivmaterialien zu Erwin Keefer.

Chicago Style (17th ed.) Citation

Keefer, Erwin. Archivmaterialien Zu Erwin Keefer.

MLA (9th ed.) Citation

Keefer, Erwin. Archivmaterialien Zu Erwin Keefer.

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