Não informado. (1990). Cartography and geographic information systems. American Congress on Surveying and Mapping.
Lua i Stíl Chicago (17ú heag.)Não informado. Cartography and Geographic Information Systems. Bethesda, Md: American Congress on Surveying and Mapping, 1990.
Lua MLA (8ú heag.)Não informado. Cartography and Geographic Information Systems. American Congress on Surveying and Mapping, 1990.
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