APA (7th ed.) Citation

Degener, O., & Degener, I. (1982). From tarweed to silversword ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Degener, Otto, and Isa Degener. From Tarweed to Silversword. [Sonderdr.]. 1982.

MLA (9th ed.) Citation

Degener, Otto, and Isa Degener. From Tarweed to Silversword. [Sonderdr.]. 1982.

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