OSullivan, D. (2010). Geographic information analysis ed.2. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)OSullivan, David. Geographic Information Analysis Ed.2. John Wiley & Sons, 2010.
Lua MLA (8ú heag.)OSullivan, David. Geographic Information Analysis Ed.2. John Wiley & Sons, 2010.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.