Não informado. (1963). Highway research record. National Research Council, Highway Research Board.
Citação do estilo Chicago (17ª ed.)Não informado. Highway Research Record. Washington: National Research Council, Highway Research Board, 1963.
Citação MLA (8ª ed.)Não informado. Highway Research Record. National Research Council, Highway Research Board, 1963.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.