APA استشهاد

Longley, P. A., & Longley, P. (2011). Geographic information systems & science (3rd ed.). Wiley.

استشهاد بنمط شيكاغو

Longley, Paul A., و Paul Longley. Geographic Information Systems & Science. 3rd ed. Hoboken, NJ: Wiley, 2011.

MLA استشهاد

Longley, Paul A., و Paul Longley. Geographic Information Systems & Science. 3rd ed. Wiley, 2011.