Παραπομπή APA

Wilpen L. Gorr, & Wilpen L. Gorr; Kristen S. Kurland. (2007). Learning and using geographic information systems: ArcGIS edition. Boston, Mass: Thomson Course Technology.

Παραπομπή Chicago Style

Wilpen L. Gorr, και Wilpen L. Gorr; Kristen S. Kurland. Learning and Using Geographic Information Systems: ArcGIS Edition. Boston, Mass: Thomson Course Technology, 2007.

Παραπομπή MLA

Wilpen L. Gorr, και Wilpen L. Gorr; Kristen S. Kurland. Learning and Using Geographic Information Systems: ArcGIS Edition. Boston, Mass: Thomson Course Technology, 2007.

Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.