Dyfyniad APA

Longley, P. A. (2011). Geographic information systems and science (Ed.3.). John Wiley.

Dyfyniad Arddull Chicago

Longley, Paul A. Geographic Information Systems and Science. Ed.3. London: John Wiley, 2011.

Dyfyniad MLA

Longley, Paul A. Geographic Information Systems and Science. Ed.3. John Wiley, 2011.

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