Clarke, K. C. (2003). Getting started with geographic information systems (4th ed.). Pearson Education.
Chicago-Zitierstil (17. Ausg.)Clarke, Keith C. Getting Started with Geographic Information Systems. 4th ed. Upper Saddle River, N.J: Pearson Education, 2003.
MLA-Zitierstil (9. Ausg.)Clarke, Keith C. Getting Started with Geographic Information Systems. 4th ed. Pearson Education, 2003.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.