Boehm, R. G. (1995). Glencoe world geography: A physical and cultural approach (Texas ed.). New York: Glencoe/McGraw-Hill.
Trích dẫn kiểu ChicagoBoehm, Richard G. Glencoe World Geography: A Physical and Cultural Approach. Texas ed. New York: Glencoe/McGraw-Hill, 1995.
Deismireacht MLABoehm, Richard G. Glencoe World Geography: A Physical and Cultural Approach. Texas ed. New York: Glencoe/McGraw-Hill, 1995.
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