Cita APA (7th ed.)

Gray, P. (1961). The encyclopedia of the biological sciences. Reinhold.

Cita Chicago (17th ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. New Yoprk: Reinhold, 1961.

Cita MLA (9th ed.)

Gray, Peter. The Encyclopedia of the Biological Sciences. Reinhold, 1961.