Não informado. (1975). Paper Technology and Industry. British Paper and Board Industry Federation.
Citação do estilo Chicago (17ª ed.)Não informado. Paper Technology and Industry. London: British Paper and Board Industry Federation, 1975.
Citação MLA (8ª ed.)Não informado. Paper Technology and Industry. British Paper and Board Industry Federation, 1975.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.