APA (7th ed.) Citation

McQueen, J., & MacQueen, B. (1993). The world of orchids. Timber Press [u.a.].

Chicago Style (17th ed.) Citation

McQueen, Jim, and Barbara MacQueen. The World of Orchids. Portland, Oregon [u.a.]: Timber Press [u.a.], 1993.

MLA (9th ed.) Citation

McQueen, Jim, and Barbara MacQueen. The World of Orchids. Timber Press [u.a.], 1993.