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MLA

United States, et al. "Papillomatous Digital Dermatitis On U.s. Dairy Operations : Footwarts." ,

APA

United States, U. States, Animal and Plant Health Inspection Service, A. and Plant Health Inspection Service, Veterinary Services, V. Services, & National Animal Health Monitoring System (U.S.), N. Animal Health Monitoring System (U.S.). (1997). Papillomatous digital dermatitis on U.S. dairy operations : footwarts.

Chicago

United States, Animal and Plant Health Inspection Service, Veterinary Services, and National Animal Health Monitoring System (U.S.). "Papillomatous digital dermatitis on U.S. dairy operations : footwarts" (1997):