Martin, D. (1991). Geographic information systems and their socioeconomic applications. Routledge.
Lua i Stíl Chicago (17ú heag.)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. London ; New York: Routledge, 1991.
Lua MLA (9ú heag.)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. Routledge, 1991.
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