HELFERT ERICH A. (1988). TECHNIQUES OF FINANCIAL ANALYSIS (6.). UNIVERSAL BOOKS.
芝加哥风格引文HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 6. NEW DELHI: UNIVERSAL BOOKS, 1988.
MLA引文HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 6. UNIVERSAL BOOKS, 1988.
警告：这些引文格式不一定是100％准确.