APA (7th ed.) Citation

Millar, A., Mackay, R. D., & Mackay, M. (1999). Orchids of Papua New Guinea. Timber Press.

Chicago Style (17th ed.) Citation

Millar, Andreé, Roy D. Mackay, and Margaret Mackay. Orchids of Papua New Guinea. Portland, Or.: Timber Press, 1999.

MLA (9th ed.) Citation

Millar, Andreé, et al. Orchids of Papua New Guinea. Timber Press, 1999.