Não informado. (1961). Preservation News. National Trust for Historic Preservation.
Chicago-referens (17:e uppl.)Não informado. Preservation News. Washington: National Trust for Historic Preservation, 1961.
MLA-referens (8:e uppl.)Não informado. Preservation News. National Trust for Historic Preservation, 1961.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.