Campbell, J., & Shin, M. (2011). Essentials of Geographic Information Systems. Saylor Foundation.
Chicago (17e ed.) BronvermeldingCampbell, Jonathan, en MIchael Shin. Essentials of Geographic Information Systems. [Place of publication not identified]: Saylor Foundation, 2011.
MLA (9e ed.) BronvermeldingCampbell, Jonathan, en MIchael Shin. Essentials of Geographic Information Systems. Saylor Foundation, 2011.
Let op: Deze citaties zijn niet altijd 100% accuraat.