APA (7th ed.) Citation

Obermeyer, N. J. (1994). Managing geographic information systems. The Guilford Press.

Chicago Style (17th ed.) Citation

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

MLA (9th ed.) Citation

Obermeyer, Nancy J. Managing Geographic Information Systems. The Guilford Press, 1994.