Gaya APA

Gorr, W, L., Kurland, K, S. (2011). GIS tutorial : basic workbook . Redlands, California: ESRI Press.

Gaya MLA

Gorr, Wilpen, L.., Kurland, Kristen, S.. "GIS tutorial : basic workbook". Redlands, California: ESRI Press, 2011. Teks.