APA aipamena

Watson, L., & Ritchie, T. (1981). Sea guide to whales of the world. Hutchinson.

Chicago Style aipamena

Watson, Lyall, and Tom Ritchie. Sea Guide to Whales of the World. London: Hutchinson, 1981.

MLA aipamena

Watson, Lyall, and Tom Ritchie. Sea Guide to Whales of the World. Hutchinson, 1981.