Não informado. (1954). Records of the Geological Survey of Nigeria. Ministry of Mines and Power.
Lua i Stíl Chicago (17ú heag.)Não informado. Records of the Geological Survey of Nigeria. Lagos: Ministry of Mines and Power, 1954.
Lua MLA (8ú heag.)Não informado. Records of the Geological Survey of Nigeria. Ministry of Mines and Power, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.