APA aipamena

Obermeyer, N. J. (1994). Managing geographic information systems. New York: Guilford Press.

Chicago Style aipamena

Obermeyer, Nancy J. Managing Geographic Information Systems. New York: Guilford Press, 1994.

MLA aipamena

Obermeyer, Nancy J. Managing Geographic Information Systems. New York: Guilford Press, 1994.

Kontuz: berrikusi erreferentzia hauek erabili aurretik.