(1946). Professional Geographer. The Association of American Geographer.
Citazione stile Chigago Style (17a edizione)Professional Geographer. Hamilton, N. Y: The Association of American Geographer, 1946.
Citatione MLA (9a ed.)Professional Geographer. The Association of American Geographer, 1946.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.