HELFERT ERICH A. (1977). TECHNIQUES OF FINANCIAL ANALYSIS (4TH.). RICHARD D.IRWIN INC.
芝加哥风格引文HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 4TH. ONTARIO: RICHARD D.IRWIN INC, 1977.
MLA引文HELFERT ERICH A. TECHNIQUES OF FINANCIAL ANALYSIS. 4TH. RICHARD D.IRWIN INC, 1977.
警告：这些引文格式不一定是100％准确.