APA aipamena

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

Chicago Style aipamena

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

MLA aipamena

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