APA (7th ed.) Citation

Janssen, J. Archivmaterialien zu Johannes Janssen, 1829-1891.

Chicago Style (17th ed.) Citation

Janssen, Johannes. Archivmaterialien Zu Johannes Janssen, 1829-1891.

MLA (9th ed.) Citation

Janssen, Johannes. Archivmaterialien Zu Johannes Janssen, 1829-1891.

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