Performance and profitability : a manual of productivity and cost reduction techniques for industry and commerce / M. J. Clay and B. H. Walley. Clay, Michael John. Walley, Brian Halford. Costs, Industrial. Value analysis (Cost control) 658 CLP Includes bibliographical references and index. London : Longmans, 1965. 1965. 1965 Text xvi, 610 p. : eng Management studies series ;