Gorr, W. L., & Kurland, K. S. (2016). GIS tutorial 1: Basic workbook. Esri Press.
Cita Chicago (17th ed.)Gorr, Wilpen L., i Kristen S. Kurland. GIS Tutorial 1: Basic Workbook. New York: Esri Press, 2016.
Cita MLA (9th ed.)Gorr, Wilpen L., i Kristen S. Kurland. GIS Tutorial 1: Basic Workbook. Esri Press, 2016.
Atenció: Aquestes cites poden no estar 100% correctes.