Gabler, R. E. (2007). Essentials of physical geography. Australia: Thomson Brooks/cole.
Chicago Style aipamenaGabler, Robert E. Essentials of Physical Geography. Australia: Thomson Brooks/cole, 2007.
MLA aipamenaGabler, Robert E. Essentials of Physical Geography. Australia: Thomson Brooks/cole, 2007.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.