Não informado. (1957). Nigerian Geographical Journal. Nigerian Geographical Association.
Chicagoスタイル(17版)引用形式Não informado. Nigerian Geographical Journal. Ibadan, Nigeria: Nigerian Geographical Association, 1957.
MLA(8版)引用形式Não informado. Nigerian Geographical Journal. Nigerian Geographical Association, 1957.
警告: この引用は必ずしも正確ではありません.