Não informado. (1919). National Parks Magazine. National Parks Association.
Chicagoスタイル(17版)引用形式Não informado. National Parks Magazine. Washington: National Parks Association, 1919.
MLA(8版)引用形式Não informado. National Parks Magazine. National Parks Association, 1919.
警告: この引用は必ずしも正確ではありません.