APA

Walter H. e., Sayles L. P., . (1949). Biology of the vertebrates : a comparative study of man and his animal allies. New York: Macmillan.

Chicago

Walter Herbert e, Sayles Leonard P, . 1949. Biology of the vertebrates : a comparative study of man and his animal allies. New York: Macmillan.

Harvard

Walter H. e., Sayles L. P., . (1949). Biology of the vertebrates : a comparative study of man and his animal allies. New York: Macmillan.

MLA

Walter Herbert e, Sayles Leonard P, . Biology of the vertebrates : a comparative study of man and his animal allies. New York: Macmillan. 1949.