APA (7th ed.) Zitazioa

Heywood, I., Cornelius, S., & Carver, S. (2011). An introduction to geographical information systems (4a. ed.). Pearson Education Limited.

Chicago Style (17th ed.) Zitazioa

Heywood, Ian, Sarah Cornelius, eta Steve Carver. An Introduction to Geographical Information Systems. 4a. ed. Essex: Pearson Education Limited, 2011.

MLA (9th ed.) Zitazioa

Heywood, Ian, et al. An Introduction to Geographical Information Systems. 4a. ed. Pearson Education Limited, 2011.