CHOE BOUM J. (1981). GLOBLE ENERGY PROSPECTS. WORLD BANK.
Lua i Stíl Chicago (17ú heag.)CHOE BOUM J. GLOBLE ENERGY PROSPECTS. U.S. A: WORLD BANK, 1981.
Lua MLA (9ú heag.)CHOE BOUM J. GLOBLE ENERGY PROSPECTS. WORLD BANK, 1981.
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