APA (7th ed.) Citation

(1991). Von Robert Ritter zu Hermann Arnold. [s.n.].

Chicago Style (17th ed.) Citation

Von Robert Ritter Zu Hermann Arnold. [s.n.], 1991.

MLA (8th ed.) Citation

Von Robert Ritter Zu Hermann Arnold. [s.n.], 1991.

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