Helfert, E. (1987). Techniques of financial analysis (6th.). Universal Book Stall.
Chicago-čujuhus (17. p.)Helfert, Erich. Techniques of Financial Analysis. 6th. New Delhi: Universal Book Stall, 1987.
MLA-čujuhus (9. p.)Helfert, Erich. Techniques of Financial Analysis. 6th. Universal Book Stall, 1987.
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