WHEELER, J. O., & MULLER, P. O. (1986). Economic Geography. John Wiley and Sons.
Lua i Stíl Chicago (17ú heag.)WHEELER, James O., agus Peter O. MULLER. Economic Geography. New York: John Wiley and Sons, 1986.
Lua MLA (9ú heag.)WHEELER, James O., agus Peter O. MULLER. Economic Geography. John Wiley and Sons, 1986.
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