APA (7th ed.) Citation

Stewart, J., Hermans, J., & Campbell, B. (2006). Angraecoid orchids: Species from the African region. Timber Press.

Chicago Style (17th ed.) Citation

Stewart, Joyce, Johan Hermans, and Bob Campbell. Angraecoid Orchids: Species from the African Region. Portland, Or: Timber Press, 2006.

MLA (9th ed.) Citation

Stewart, Joyce, et al. Angraecoid Orchids: Species from the African Region. Timber Press, 2006.