Helfert, E. A. (1997). Techniques of financial analysis: A modern approach (9thed.). Irwin.
Chicago Style (17. basım) AtıfHelfert, Erich A. Techniques of Financial Analysis: A Modern Approach. 9thed. Chicago: Irwin, 1997.
MLA (9th ed.) AtıfHelfert, Erich A. Techniques of Financial Analysis: A Modern Approach. 9thed. Irwin, 1997.
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