Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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