Dyfyniad APA

Peter A Burrough & McDonnell Rachael A. (1998). Principles of Geographical Information systems. Oxford University Press.

Dyfyniad Arddull Chicago

Peter A Burrough and McDonnell Rachael A. Principles of Geographical Information Systems. New York: Oxford University Press, 1998.

Dyfyniad MLA

Peter A Burrough and McDonnell Rachael A. Principles of Geographical Information Systems. Oxford University Press, 1998.

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