APA (7th ed.) Zitazioa
Heywood, D. I., Carver, S., & Cornelius, S. (2011). An introduction to geographical information systems (4th ed.). Prentice Hall.
Chicago Style (17th ed.) Zitazioa
Heywood, D. Ian, Steve Carver, eta Sarah Cornelius. An Introduction to Geographical Information Systems. 4th ed. Harlow, England Toronto: Prentice Hall, 2011.
MLA (9th ed.) Zitazioa
Heywood, D. Ian, et al. An Introduction to Geographical Information Systems. 4th ed. Prentice Hall, 2011.
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