Soremekun, O., & Onwuka, R. I. (2014). Nigerian Petroleum Policy and External Relations. Obafemi Awolowo University.
Lua i Stíl Chicago (17ú heag.)Soremekun, Olukayode, agus R. I. Onwuka. Nigerian Petroleum Policy and External Relations. Obafemi Awolowo University, 2014.
Lua MLA (9ú heag.)Soremekun, Olukayode, agus R. I. Onwuka. Nigerian Petroleum Policy and External Relations. Obafemi Awolowo University, 2014.
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