APA

Portnoy J. W., Erwin R. M., Custer T. W., National Coastal Ecosystems Team (U.S.), Massachusetts Cooperative Wildlife Research Unit, Migratory Bird and Habitat Research Laboratory (U.S.) & Patuxent Wildlife Research Center. (1981). Atlas of gull and tern colonies. [Washington, D.C.]: The Team.

Chicago

Portnoy John W, Erwin R Michael, Custer Thomas W, National Coastal Ecosystems Team (U.S.), Massachusetts Cooperative Wildlife Research Unit, Migratory Bird and Habitat Research Laboratory (U.S.) and Patuxent Wildlife Research Center. 1981. Atlas of gull and tern colonies. [Washington, D.C.]: The Team.

Harvard

Portnoy J. W., Erwin R. M., Custer T. W., National Coastal Ecosystems Team (U.S.), Massachusetts Cooperative Wildlife Research Unit, Migratory Bird and Habitat Research Laboratory (U.S.) and Patuxent Wildlife Research Center. (1981). Atlas of gull and tern colonies. [Washington, D.C.]: The Team.

MLA

Portnoy John W, Erwin R Michael, Custer Thomas W, National Coastal Ecosystems Team (U.S.), Massachusetts Cooperative Wildlife Research Unit, Migratory Bird and Habitat Research Laboratory (U.S.) and Patuxent Wildlife Research Center. Atlas of gull and tern colonies. [Washington, D.C.]: The Team. 1981.