APA Citation

Wirth, M. 1. (1964). Supra-specific variation and classification in the Oncidiinae (Orchidaceae).

Chicago Style Citation

Wirth, Michael 1938-. Supra-specific Variation and Classification in the Oncidiinae (Orchidaceae). 1964.

MLA Citation

Wirth, Michael 1938-. Supra-specific Variation and Classification in the Oncidiinae (Orchidaceae). 1964.

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