APA (7th ed.) Citation

Helbing, F. (2019). Archivmaterialien zu Franz Helbing, 1854-.

Chicago Style (17th ed.) Citation

Helbing, Franz. Archivmaterialien Zu Franz Helbing, 1854-. 2019.

MLA (9th ed.) Citation

Helbing, Franz. Archivmaterialien Zu Franz Helbing, 1854-. 2019.

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