APA-viite (7. p.)
Helfert, E. A. (1997). Techniques of financial analysis: A practical guide to managing and measuring business performance (9th ed.). Irwin McGraw Hill.
Chicago-viite (17. p.)
Helfert, Erich A. Techniques of Financial Analysis: A Practical Guide to Managing and Measuring Business Performance. 9th ed. Chicago: Irwin McGraw Hill, 1997.
MLA-viite (9. p.)
Helfert, Erich A. Techniques of Financial Analysis: A Practical Guide to Managing and Measuring Business Performance. 9th ed. Irwin McGraw Hill, 1997.
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