Report of the World Heritage Committee, Twelfth Session, Brasilia, Brazil, 5–9 December 1988: UNESCO Convention Concerning the Protection of World Cultural and Natural Heritage, 23 de dezembro de 1988, pp. 17–18, SC-88/CONF.001/13, consultado em 9 de abril de 2007
Report of the World Heritage Committee, Fourteenth Session, Banff, Alberta, Canada, 7–12 December 1990: UNESCO Convention Concerning the Protection of World Cultural and Natural Heritage, 12 de dezembro de 1990, pp. 17–18, CLT-90/CONF.004/13, consultado em 9 de abril de 2007