Thoman, R. S., & Patton, D. J. (1964). Focus on geographic activity: A collection of original studies. New York: Mc Graw-Hill.
Παραπομπή Chicago StyleThoman, Richard S., and Donald J. Patton. Focus On Geographic Activity: A Collection of Original Studies. New York: Mc Graw-Hill, 1964.
Παραπομπή MLAThoman, Richard S., and Donald J. Patton. Focus On Geographic Activity: A Collection of Original Studies. New York: Mc Graw-Hill, 1964.
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