APA (7th ed.) Citation

Jefferson, T. A., Leatherwood, S., & Webber, M. A. (1993). Marine mammals of the world. FAO-UNEP.

Chicago Style (17th ed.) Citation

Jefferson, Thomas A., Stephen Leatherwood, and Marc A. Webber. Marine Mammals of the World. Rome, Italy: FAO-UNEP, 1993.

MLA (9th ed.) Citation

Jefferson, Thomas A., et al. Marine Mammals of the World. FAO-UNEP, 1993.