APA (7e ed.) Bronvermelding

GREENWOOD, N., & EDWARDS, J. (1979). Human environments and natural systems. -- 2nd ed. Duxbury Press.

Chicago (17e ed.) Bronvermelding

GREENWOOD, N.H, en J.M.B EDWARDS. Human Environments and Natural Systems. -- 2nd Ed. North Scituate: Duxbury Press, 1979.

MLA (9e ed.) Bronvermelding

GREENWOOD, N.H, en J.M.B EDWARDS. Human Environments and Natural Systems. -- 2nd Ed. Duxbury Press, 1979.