Cita APA (7a ed.)

Whitney, L. F., & Hahnel, P. (1955). All about guppies. Practical Science Pub. Co..

Cita Chicago Style (17a ed.)

Whitney, Leon Fradley, y Paul Hahnel. All About Guppies. Orange, Conn.: Practical Science Pub. Co., 1955.

Cita MLA (8a ed.)

Whitney, Leon Fradley, y Paul Hahnel. All About Guppies. Practical Science Pub. Co., 1955.