Não informado. (1913). Economic series. British Museum of Natural History.
Chicagoスタイル(17版)引用形式Não informado. Economic Series. London: British Museum of Natural History, 1913.
MLA(8版)引用形式Não informado. Economic Series. British Museum of Natural History, 1913.
警告: この引用は必ずしも正確ではありません.