APA (7th ed.) Citation

Royen, P. v. (1983). The genus Corybas (Orchidaceae) in its eastern areas. J. Cramer.

Chicago Style (17th ed.) Citation

Royen, P. van. The Genus Corybas (Orchidaceae) in Its Eastern Areas. Vaduz [Liechtenstein]: J. Cramer, 1983.

MLA (9th ed.) Citation

Royen, P. van. The Genus Corybas (Orchidaceae) in Its Eastern Areas. J. Cramer, 1983.