APA (7th ed.) Citation

Moldenke, H. N., & Moldenke, A. L. (1951). The mysterious Silphium ([Sonderdr.].).

Chicago Style (17th ed.) Citation

Moldenke, Harold N., and Alma L. Moldenke. The Mysterious Silphium. [Sonderdr.]. 1951.

MLA (9th ed.) Citation

Moldenke, Harold N., and Alma L. Moldenke. The Mysterious Silphium. [Sonderdr.]. 1951.

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