Apgar, Birds of the United States. American Book Company.
Beebe, The Bird. Henry Holt and Company.
Ditmars, The Reptile Book. Doubleday, Page and Company.
Hegner, Zoölogy. The Macmillan Company.
Hornaday, American Natural History.
Jordan and Evermann, Food and Game Fishes. Doubleday, Page and Company.
Parker and Haswell, Textbook of Zoölogy. The Macmillan Company.
Riverside Natural History. Houghton, Mifflin and Company.
Weed and Dearborn, Relation of Birds to Man. Lippincott.