Não informado. (1990). Cartography and geographic information systems. American Congress on Surveying and Mapping.
Chicago-Zitierstil (17. Ausg.)Não informado. Cartography and Geographic Information Systems. Bethesda, Md: American Congress on Surveying and Mapping, 1990.
MLA-Zitierstil (8. Ausg.)Não informado. Cartography and Geographic Information Systems. American Congress on Surveying and Mapping, 1990.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.