Croucher, R. M. (1976). The Observer's Book of Motorcycles. London: Frederick Warne & CO LTD.
Dyfyniad Arddull ChicagoCroucher, Robert M. The Observer's Book of Motorcycles. London: Frederick Warne & CO LTD, 1976.
Dyfyniad MLACroucher, Robert M. The Observer's Book of Motorcycles. London: Frederick Warne & CO LTD, 1976.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.