Lua APA (7ú heag.)

HELFERT ERICH A. (2000). TECHNIQUES OF FINANCIAL ANALYSIS (10TH.). MCGRAW-HILL.

Lua i Stíl Chicago (17ú heag.)

HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 10TH. NEW YORK: MCGRAW-HILL, 2000.

Lua MLA (9ú heag.)

HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 10TH. MCGRAW-HILL, 2000.

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