APA Citation

Sheehan, & Sheehan. (1994). An illustrated survey of orchid genera. Oregan: Timber Press.

Chicago Style Citation

Sheehan, and Sheehan. An Illustrated Survey of Orchid Genera. Oregan: Timber Press, 1994.

MLA Citation

Sheehan, and Sheehan. An Illustrated Survey of Orchid Genera. Oregan: Timber Press, 1994.

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