Cita APA (7a ed.)
Heywood, D. I., Carver, S., & Cornelius, S. (2011). An introduction to geographical information systems (4th ed.). Prentice Hall.
Cita Chicago Style (17a ed.)
Heywood, D. Ian, Steve Carver, y Sarah Cornelius. An Introduction to Geographical Information Systems. 4th ed. Harlow, England Toronto: Prentice Hall, 2011.
Cita MLA (9a ed.)
Heywood, D. Ian, et al. An Introduction to Geographical Information Systems. 4th ed. Prentice Hall, 2011.
Precaución: Estas citas no son 100% exactas.