Helfert, E. a. (2007). Techniques of financial analysis: A modern approach (ninth.). Tata McGraw Hill Publ.
Lua i Stíl Chicago (17ú heag.)Helfert, Erich a. Techniques of Financial Analysis: A Modern Approach. ninth. New delhi: Tata McGraw Hill Publ, 2007.
Lua MLA (9ú heag.)Helfert, Erich a. Techniques of Financial Analysis: A Modern Approach. ninth. Tata McGraw Hill Publ, 2007.
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