APA (7th ed.) Zitazioa
Jensen, R. R. (2014). Geographic information systems exercise workbook. Prentice Hall.
Chicago Style (17th ed.) Zitazioa
Jensen, Ryan R. Geographic Information Systems Exercise Workbook. Boston, Mass: Prentice Hall, 2014.
MLA (9th ed.) Zitazioa
Jensen, Ryan R. Geographic Information Systems Exercise Workbook. Prentice Hall, 2014.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.