APA

Lytle C. F., Walker W. F. & Smith F. E. (2013). General zoology. Philadelphia: Saunders.

Chicago

Lytle Charles F, Walker Warren F and Smith Frederick E. 2013. General zoology. Philadelphia: Saunders.

Harvard

Lytle C. F., Walker W. F. and Smith F. E. (2013). General zoology. Philadelphia: Saunders.

MLA

Lytle Charles F, Walker Warren F and Smith Frederick E. General zoology. Philadelphia: Saunders. 2013.