Boahen, A. A. (1983). State-Formation in Lower Guinea and The Chad-Niger Basin.
Lua i Stíl Chicago (17ú heag.)Boahen, A. Adu. State-Formation in Lower Guinea and The Chad-Niger Basin. 1983.
Lua MLA (8ú heag.)Boahen, A. Adu. State-Formation in Lower Guinea and The Chad-Niger Basin. 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.