American Association of Geographers. (1943). Professional Geographer. Association of American Geographers.
Παραπομπή σε μορφή Chicago (17η εκδ.)American Association of Geographers. Professional Geographer. Washington: Association of American Geographers, 1943.
Παραπομπή σε μορφή MLA (8th εκδ.)American Association of Geographers. Professional Geographer. Association of American Geographers, 1943.
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