APA (7th ed.) Citation

Sönnichsen, N. (2019). Archivmaterialien zu Niels Sönnichsen, 1930-2021.

Chicago Style (17th ed.) Citation

Sönnichsen, Niels. Archivmaterialien Zu Niels Sönnichsen, 1930-2021. 2019.

MLA (9th ed.) Citation

Sönnichsen, Niels. Archivmaterialien Zu Niels Sönnichsen, 1930-2021. 2019.

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