Não informado. (1888). National Geographic Magazine. National Geographic Society.
Chicagoスタイル(17版)引用形式Não informado. National Geographic Magazine. Washington: National Geographic Society, 1888.
MLA(8版)引用形式Não informado. National Geographic Magazine. National Geographic Society, 1888.
警告: この引用は必ずしも正確ではありません.