Helfert, E. A. (2003). Techniques of financial analysis: A guide to value creation (11th ed.). McGraw-Hill/Irwin.
Lua i Stíl Chicago (17ú heag.)Helfert, Erich A. Techniques of Financial Analysis: A Guide to Value Creation. 11th ed. Boston: McGraw-Hill/Irwin, 2003.
Lua MLA (9ú heag.)Helfert, Erich A. Techniques of Financial Analysis: A Guide to Value Creation. 11th ed. McGraw-Hill/Irwin, 2003.
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