Não informado. (2002). Conservation News. International Institute for Conservation of Historic and Artistic Works, United Kingdom Group.
Citação do estilo Chicago (17ª ed.)Não informado. Conservation News. London: International Institute for Conservation of Historic and Artistic Works, United Kingdom Group, 2002.
Citação MLA (8ª ed.)Não informado. Conservation News. International Institute for Conservation of Historic and Artistic Works, United Kingdom Group, 2002.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.