HUNTINGTON, E. (1947). Principles of Economic Geography. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)HUNTINGTON, Ellsworth. Principles of Economic Geography. John Wiley & Sons, 1947.
Lua MLA (8ú heag.)HUNTINGTON, Ellsworth. Principles of Economic Geography. John Wiley & Sons, 1947.
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