Cita APA (7a ed.)

Heywood, D. I., Cornelius, S., & Carver, S. (2011). An introduction to geographical information systems (Fourth edition.). Prentice Hall.

Cita Chicago Style (17a ed.)

Heywood, D. Ian, Sarah Cornelius, y Steve Carver. An Introduction to Geographical Information Systems. Fourth edition. Harlow, England: Prentice Hall, 2011.

Cita MLA (8a ed.)

Heywood, D. Ian, et al. An Introduction to Geographical Information Systems. Fourth edition. Prentice Hall, 2011.