Barrera-Rey, F. (1995). The effects of vertical integration on oil company performance. Oxford Institute for Energy Studies.
Lua i Stíl Chicago (17ú heag.)Barrera-Rey, F. The Effects of Vertical Integration on Oil Company Performance. Oxford Institute for Energy Studies, 1995.
Lua MLA (9ú heag.)Barrera-Rey, F. The Effects of Vertical Integration on Oil Company Performance. Oxford Institute for Energy Studies, 1995.
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