Obermeyer, N. J. (1994). Managing geographic information systems. New York: Guilford Press.
Trích dẫn kiểu ChicagoObermeyer, Nancy J. Managing Geographic Information Systems. New York: Guilford Press, 1994.
Deismireacht MLAObermeyer, Nancy J. Managing Geographic Information Systems. New York: Guilford Press, 1994.
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