Não informado. (1954). Records of the Geological Survey of Nigeria. Ministry of Mines and Power.
Chicagoスタイル(17版)引用形式Não informado. Records of the Geological Survey of Nigeria. Lagos: Ministry of Mines and Power, 1954.
MLA(8版)引用形式Não informado. Records of the Geological Survey of Nigeria. Ministry of Mines and Power, 1954.
警告: この引用は必ずしも正確ではありません.