Martin, D. (1991). Geographic information systems and their socioeconomic applications. Routledge.
Chicago-referens (17:e uppl.)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. London ; New York: Routledge, 1991.
MLA-referens (9:e uppl.)Martin, David. Geographic Information Systems and Their Socioeconomic Applications. Routledge, 1991.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.