Não informado. (1949). Historic preservation. National Trust for Historic Preservation.
Cita Chicago Style (17a ed.)Não informado. Historic Preservation. Washington: National Trust for Historic Preservation, 1949.
Cita MLA (8a ed.)Não informado. Historic Preservation. National Trust for Historic Preservation, 1949.
Precaución: Estas citas no son 100% exactas.