APA (7th ed.) Citation

Heywood, I., Cornelius, S., & Carver, S. (1998). An introduction to geographical information systems. Prentice-Hall.

Chicago Style (17th ed.) Citation

Heywood, Ian, Sarah Cornelius, and Steve Carver. An Introduction to Geographical Information Systems. Upper Saddle River: Prentice-Hall, 1998.

MLA (9th ed.) Citation

Heywood, Ian, et al. An Introduction to Geographical Information Systems. Prentice-Hall, 1998.