Não informado. (1952). Studies in conservation. International Institute for the Conservation of Historic and Artistic.
Citação do estilo Chicago (17ª ed.)Não informado. Studies in Conservation. London: International Institute for the Conservation of Historic and Artistic, 1952.
Citação MLA (8ª ed.)Não informado. Studies in Conservation. International Institute for the Conservation of Historic and Artistic, 1952.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.