Swanson, J. L. (1987). LaidLaw world geography: A physical and cultural approach. Glencoe.
Lua i Stíl Chicago (17ú heag.)Swanson, James L. LaidLaw World Geography: A Physical and Cultural Approach. New York: Glencoe, 1987.
Lua MLA (8ú heag.)Swanson, James L. LaidLaw World Geography: A Physical and Cultural Approach. Glencoe, 1987.
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