Chang, K. (2002). Introduction to geographic information systems [ada CD]. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Chang, Kang-tsung. Introduction to Geographic Information Systems [ada CD]. McGraw-Hill, 2002.
Lua MLA (8ú heag.)Chang, Kang-tsung. Introduction to Geographic Information Systems [ada CD]. McGraw-Hill, 2002.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.