Allen, P. W. (1972). Natural Rubber and the Synthetics. Crosby Lockwood.
Dyfyniad Arddull ChicagoAllen, P W. Natural Rubber and the Synthetics. London: Crosby Lockwood, 1972.
Dyfyniad MLAAllen, P W. Natural Rubber and the Synthetics. Crosby Lockwood, 1972.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.