Dyfyniad APA

GEOGRAPHICAL & MAGUIRE, D. J. [. (1991). Geographical information systems: Principles and appli-cations. Longman.

Dyfyniad Arddull Chicago

GEOGRAPHICAL and David J [ed] MAGUIRE. Geographical Information Systems: Principles and Appli-cations. New York: Longman, 1991.

Dyfyniad MLA

GEOGRAPHICAL and David J [ed] MAGUIRE. Geographical Information Systems: Principles and Appli-cations. Longman, 1991.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.