BALL ROBERT. (1984). MANAGEMETN TECHNIQUES & QUANTITATIVE METHODS. HEINEMANN.
Chicago-čujuhus (17. p.)BALL ROBERT. MANAGEMETN TECHNIQUES & QUANTITATIVE METHODS. LONDON: HEINEMANN, 1984.
MLA-čujuhus (9. p.)BALL ROBERT. MANAGEMETN TECHNIQUES & QUANTITATIVE METHODS. HEINEMANN, 1984.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.