APA استشهاد

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

استشهاد بنمط شيكاغو

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

MLA استشهاد

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