APA (7th ed.) Citation

Marks, D. R. (2018). Mute swans. U.S. Department of Agriculture, Animal & Plant Health Inspection Service, Wildlife Services.

Chicago Style (17th ed.) Citation

Marks, David R. Mute Swans. Fort Collins, Colorado: U.S. Department of Agriculture, Animal & Plant Health Inspection Service, Wildlife Services, 2018.

MLA (9th ed.) Citation

Marks, David R. Mute Swans. U.S. Department of Agriculture, Animal & Plant Health Inspection Service, Wildlife Services, 2018.