APA (7th ed.) Citation

British Iris Society Species Group & King, C. (1997). A guide to species irises: Their identification and cultivation. Cambridge University Press.

Chicago Style (17th ed.) Citation

British Iris Society Species Group and Christabel King. A Guide to Species Irises: Their Identification and Cultivation. Cambridge: Cambridge University Press, 1997.

MLA (8th ed.) Citation

British Iris Society Species Group and Christabel King. A Guide to Species Irises: Their Identification and Cultivation. Cambridge University Press, 1997.