Heywood, I., Cornelius, S., & Carver, S. (1998). An introduction to geographical information systems. Prentice-Hall.
Citazione stile Chigago Style (17a edizione)Heywood, Ian, Sarah Cornelius, e Steve Carver. An Introduction to Geographical Information Systems. Upper Saddle River: Prentice-Hall, 1998.
Citatione MLA (9a ed.)Heywood, Ian, et al. An Introduction to Geographical Information Systems. Prentice-Hall, 1998.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.