Cita APA (7th ed.)
Heywood, D. I., Carver, S., & Cornelius, S. (2011). An introduction to geographical information systems (4th ed.). Prentice Hall.
Cita Chicago (17th ed.)
Heywood, D. Ian, Steve Carver, i Sarah Cornelius. An Introduction to Geographical Information Systems. 4th ed. Harlow, England Toronto: Prentice Hall, 2011.
Cita MLA (9th ed.)
Heywood, D. Ian, et al. An Introduction to Geographical Information Systems. 4th ed. Prentice Hall, 2011.
Atenció: Aquestes cites poden no estar 100% correctes.