Martin, D. (1996). Geographic information systems: Socioeconomic applications (2nd ed.). Routledge.
Lua i Stíl Chicago (17ú heag.)Martin, David. Geographic Information Systems: Socioeconomic Applications. 2nd ed. London, New York: Routledge, 1996.
Lua MLA (9ú heag.)Martin, David. Geographic Information Systems: Socioeconomic Applications. 2nd ed. Routledge, 1996.
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