Helefert, E. A. (2013). Techniques of financial analysis. Jaico Publishing House.
Lua i Stíl Chicago (17ú heag.)Helefert, Erich A. Techniques of Financial Analysis. Mumbai: Jaico Publishing House, 2013.
Lua MLA (9ú heag.)Helefert, Erich A. Techniques of Financial Analysis. Jaico Publishing House, 2013.
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