ALEXANDER, J. W., & GIBSON, L. J. (1979). Economic geography.-- ed.2. Prentice Hall.
Lua i Stíl Chicago (17ú heag.)ALEXANDER, John W., agus Lay James GIBSON. Economic Geography.-- Ed.2. London: Prentice Hall, 1979.
Lua MLA (9ú heag.)ALEXANDER, John W., agus Lay James GIBSON. Economic Geography.-- Ed.2. Prentice Hall, 1979.
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