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Dyfyniad Arddull ChicagoREID PETER C. WELL MADE IN AMERICA: LESSONS FROM HARLEY DAVIDSON ON BEING THE BEST. NEW YORK: MCGRAW-HILL, 1990.
Dyfyniad MLAREID PETER C. WELL MADE IN AMERICA: LESSONS FROM HARLEY DAVIDSON ON BEING THE BEST. MCGRAW-HILL, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.