Booth, E. S. (1950). How to know the mammals: Pictured-keys for determining to species, all of the mammals of the United States and southern Canada with maps showing their geographic distribution, and many pages of helps for their successful study. W.C. Brown.

Booth, Ernest Sheldon. How to Know the Mammals: Pictured-keys for Determining to Species, All of the Mammals of the United States and Southern Canada with Maps Showing Their Geographic Distribution, and Many Pages of Helps for Their Successful Study. Dubuque, Iowa: W.C. Brown, 1950.

Booth, Ernest Sheldon. How to Know the Mammals: Pictured-keys for Determining to Species, All of the Mammals of the United States and Southern Canada with Maps Showing Their Geographic Distribution, and Many Pages of Helps for Their Successful Study. W.C. Brown, 1950.