Helfert, Erich A. Techniques of financial analysis / Erich A. Helfert. - 6th ed. - Homewood, Ill. : R.D. Irwin, 1987. - xiii, 458 p. : ill. ; 23 cm. ISBN: 0870942743 Subjects--Topical Terms: Corporations--Finance.Cash flow.Financial statements.Ratio analysis.