APA (7th ed.) Citation

Baker, M. L., & Baker, C. O. (1991). Orchid species culture. Timber Press.

Chicago Style (17th ed.) Citation

Baker, Margaret L., and Charles O. Baker. Orchid Species Culture. Portland, Or.: Timber Press, 1991.

MLA (9th ed.) Citation

Baker, Margaret L., and Charles O. Baker. Orchid Species Culture. Timber Press, 1991.