APA (7th ed.) Citation

Zimmermann, A., & Dougoud, R. (1961). Tropische Orchideen. Kümmerly & Frey.

Chicago Style (17th ed.) Citation

Zimmermann, Albert, and Roger Dougoud. Tropische Orchideen. Bern: Kümmerly & Frey, 1961.

MLA (9th ed.) Citation

Zimmermann, Albert, and Roger Dougoud. Tropische Orchideen. Kümmerly & Frey, 1961.