APA-čujuhus (7. p.)
Akpan-Umana, O. (2013). An introduction to the modern Gulf of Guinea: People, history, political economy and strategic future. Adonis & Abbey Publishers Ltd.
Chicago-čujuhus (17. p.)
Akpan-Umana, Otoabasi. An Introduction to the Modern Gulf of Guinea: People, History, Political Economy and Strategic Future. London, England ; Asokoro, Nigeria: Adonis & Abbey Publishers Ltd, 2013.
MLA-čujuhus (9. p.)
Akpan-Umana, Otoabasi. An Introduction to the Modern Gulf of Guinea: People, History, Political Economy and Strategic Future. Adonis & Abbey Publishers Ltd, 2013.
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