COWELL DONALD W. (1984). MARKETING SERVICES. HEINEMANN.
Chicago-čujuhus (17. p.)COWELL DONALD W. MARKETING SERVICES. LONDON: HEINEMANN, 1984.
MLA-čujuhus (9. p.)COWELL DONALD W. MARKETING SERVICES. HEINEMANN, 1984.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.