APA (7th ed.) Citation

Helm, F. (2019). Archivmaterialien zu Friedrich Helm, 1636-1672.

Chicago Style (17th ed.) Citation

Helm, Friedrich. Archivmaterialien Zu Friedrich Helm, 1636-1672. 2019.

MLA (9th ed.) Citation

Helm, Friedrich. Archivmaterialien Zu Friedrich Helm, 1636-1672. 2019.

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