APA (7th ed.) Citation

St. George, I., Irwin, B., & Hatch, E. D. (1996). Field guide to the New Zealand orchids. New Zealand Native Orchid Group.

Chicago Style (17th ed.) Citation

St. George, Ian, Bruce Irwin, and Edwin Daniel Hatch. Field Guide to the New Zealand Orchids. Wellington: New Zealand Native Orchid Group, 1996.

MLA (9th ed.) Citation

St. George, Ian, et al. Field Guide to the New Zealand Orchids. New Zealand Native Orchid Group, 1996.