Não informado. (1911). Annals of the Association of American Geographers. Association of American Geographers.
শিকাগো স্টাইল (17 তম সংস্করণ) উদ্ধৃতিNão informado. Annals of the Association of American Geographers. Washington: Association of American Geographers, 1911.
M.L.A (8 ম সংস্করণ) উদ্ধৃতিNão informado. Annals of the Association of American Geographers. Association of American Geographers, 1911.
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