Gaya APA

Longley, P, A. et al (2005). Geographical information systems: principles, techniques, management, and applications (Second edition). New Jersey: John Wiley & Sons Inc.

Gaya MLA

Longley, Paul, A.. et al. "Geographical information systems: principles, techniques, management, and applications". Second edition New Jersey: John Wiley & Sons Inc, 2005. Text.