Schodt, D. W. The Ecuadorian Petroleum Sector during the Petroleum period: 1972-1983.
Chicago-čujuhus (17. p.)Schodt, David W. The Ecuadorian Petroleum Sector During the Petroleum Period: 1972-1983.
MLA-čujuhus (9. p.)Schodt, David W. The Ecuadorian Petroleum Sector During the Petroleum Period: 1972-1983.
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