Tohutoro APA (7th ed.)
Longley, P. A. Geographical Information Systems: Principles, Techniques, Management, and Applications (2a edición.). Wiley.
Tohutoru Kātū Chicago (17th ed.)
Longley, Paul A. Geographical Information Systems: Principles, Techniques, Management, and Applications. 2a edición. Hoboken, EUA: Wiley.
Tohutoro MLA (9th ed.)
Longley, Paul A. Geographical Information Systems: Principles, Techniques, Management, and Applications. 2a edición. Wiley.
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