Cita APA

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

Citación estilo Chicago

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

Cita MLA

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