LEHMANN DONALD R. (1985). MARKET RESEARCH AND ANALYSIS (2ND.). IRWIN.
Chicago-čujuhus (17. p.)LEHMANN DONALD R. MARKET RESEARCH AND ANALYSIS. 2ND. HOMWOOD: IRWIN, 1985.
MLA-čujuhus (9. p.)LEHMANN DONALD R. MARKET RESEARCH AND ANALYSIS. 2ND. IRWIN, 1985.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.