Não informado. (1949). Historic preservation. National Trust for Historic Preservation.
Chicagoスタイル(17版)引用形式Não informado. Historic Preservation. Washington: National Trust for Historic Preservation, 1949.
MLA(8版)引用形式Não informado. Historic Preservation. National Trust for Historic Preservation, 1949.
警告: この引用は必ずしも正確ではありません.