Dyfyniad APA

Gorr, W. L., & Kurkland, K. S. (2008). GIS tutorial workbook ArcView 9.3 (3rd ed.). ESRI Press.

Dyfyniad Arddull Chicago

Gorr, Wilpen L., and Kristen Seamens Kurkland. GIS Tutorial Workbook ArcView 9.3. 3rd ed. Redlands, Calif: ESRI Press, 2008.

Dyfyniad MLA

Gorr, Wilpen L., and Kristen Seamens Kurkland. GIS Tutorial Workbook ArcView 9.3. 3rd ed. ESRI Press, 2008.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.