Dyfyniad APA

Burrough, P. A., & Mc Donnell, R. A. (1998). Principles of geographical information systems. Oxford University Press.

Dyfyniad Arddull Chicago

Burrough, Peter A., and Rachael A. Mc Donnell. Principles of Geographical Information Systems. New york: Oxford University Press, 1998.

Dyfyniad MLA

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

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