Lua APA (7ú heag.)
Star, J., & Estes, J. Geographic Information Systems: An Introduction. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)
Star, Jeffrey, agus John Estes. Geographic Information Systems: An Introduction. Englewood Cliffs, EUA: Prentice-Hall.
Lua MLA (9ú heag.)
Star, Jeffrey, agus John Estes. Geographic Information Systems: An Introduction. Prentice-Hall.
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