Chrisman, N. R. (1997). Exploring geographic information systems. New York: John Wiley and Sons.
Chicago Style aipamenaChrisman, Nicholas R. Exploring Geographic Information Systems. New York: John Wiley and Sons, 1997.
MLA aipamenaChrisman, Nicholas R. Exploring Geographic Information Systems. New York: John Wiley and Sons, 1997.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.