Pyhrr, Peter A., 1942- Zero-base budgeting; : a practical management tool for evaluating expenses [electronic resource] / [by] Peter A. Pyhrr.. — New York, : Wiley, [c1973]. — xv, 231 p. : illus. 23 cm. — (Wiley series on systems and controls for financial management). - Systems and controls for financial management series. .