Cita APA (7th ed.)

Gray, D. E. (1966). Man and his physical world. D. Van Nostrand.

Cita Chicago (17th ed.)

Gray, Dwight E. Man and His Physical World. Princeton: D. Van Nostrand, 1966.

Cita MLA (9th ed.)

Gray, Dwight E. Man and His Physical World. D. Van Nostrand, 1966.