APA (7th ed.) Citation

Williams, J. G., Williams, A. E., & Arlott, N. (1983). Field guide to orchids of North America: From Alaska, Greenland, and the Arctic, south to the Mexican border. Universe Books.

Chicago Style (17th ed.) Citation

Williams, John G., Andrew E. Williams, and Norman Arlott. Field Guide to Orchids of North America: From Alaska, Greenland, and the Arctic, South to the Mexican Border. New York: Universe Books, 1983.

MLA (9th ed.) Citation

Williams, John G., et al. Field Guide to Orchids of North America: From Alaska, Greenland, and the Arctic, South to the Mexican Border. Universe Books, 1983.