(2016). Key Methods in Geography (3rd ed.). Sage.
Chicago Style (17th ed.) ZitazioaKey Methods in Geography. 3rd ed. New Delhi: Sage, 2016.
MLA (9th ed.) ZitazioaKey Methods in Geography. 3rd ed. Sage, 2016.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.