Cunningham, W. P. (1997). Environmental science: A global concern (4th.ed.). Wm.C.Brown.
Chicago (17e ed.) BronvermeldingCunningham, William P. Environmental Science: A Global Concern. 4th.ed. Dubuque: Wm.C.Brown, 1997.
MLA (9e ed.) BronvermeldingCunningham, William P. Environmental Science: A Global Concern. 4th.ed. Wm.C.Brown, 1997.
Let op: Deze citaties zijn niet altijd 100% accuraat.