APA-viite

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

Chicago-tyylinen lähdeviittaus

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

MLA-viite

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