Παραπομπή σε μορφή APA (7η εκδ.)

Gray, D. E. (1946). Man and his physical world (2nd ed.). D. Van Nostrand Company.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Gray, Dwight E. Man and His Physical World. 2nd ed. New York: D. Van Nostrand Company, 1946.

Παραπομπή σε μορφή MLA (8th εκδ.)

Gray, Dwight E. Man and His Physical World. 2nd ed. D. Van Nostrand Company, 1946.