Citazione Stile APA (7a Edizione)

Greenwood, N. H., & J.M.B. Edwards. (1979). Human environments and natural systems (2nd ed.). Duxbury Pr..

Citazione stile Chigago Style (17a edizione)

Greenwood, N. H., e J.M.B. Edwards. Human Environments and Natural Systems. 2nd ed. North Scituate, Mass: Duxbury Pr., 1979.

Citatione MLA (9a ed.)

Greenwood, N. H., e J.M.B. Edwards. Human Environments and Natural Systems. 2nd ed. Duxbury Pr., 1979.