Helfert, Erich A. Techniques of financial analysis/ Helfert, Erich A. - U.S.A. : Irwin, c1997. - xix 457 p. ; 23 cm. Include index. ISBN: 0-7863-1120-7-0-256-14611 Dewey Class. No.: Circ. 658.151 H367t 1997