Gaya APA

Gorr, W, L. (2007). GIS tutorial updated for ARCGIS 9.2: Workbook for ARCVIEW 9 . California: ESRI Press.

Gaya MLA

Gorr, Wilpen, L.. "GIS tutorial updated for ARCGIS 9.2: Workbook for ARCVIEW 9". California: ESRI Press, 2007. Text.