APA-referens

Wadsworth, R., & Treweek, J. . O. (1999). Geographical information systems for ecology: An introduction. Longman.

Chicago-stil citat

Wadsworth, Richard, och J O. Treweek. Geographical Information Systems for Ecology: An Introduction. London: Longman, 1999.

MLA-referens

Wadsworth, Richard, och J O. Treweek. Geographical Information Systems for Ecology: An Introduction. Longman, 1999.