APA (7th ed.) Citation

Petersen, W. E. (1944). The Cow's Udder. University Farm.

Chicago Style (17th ed.) Citation

Petersen, W. E. The Cow's Udder. St. Paul: University Farm, 1944.

MLA (9th ed.) Citation

Petersen, W. E. The Cow's Udder. University Farm, 1944.