ROBERTS-PHELPS GRAHAM. (2000). SALES TRAINING GAMES. GOWER.
Chicago-čujuhus (17. p.)ROBERTS-PHELPS GRAHAM. SALES TRAINING GAMES. U S A: GOWER, 2000.
MLA-čujuhus (9. p.)ROBERTS-PHELPS GRAHAM. SALES TRAINING GAMES. GOWER, 2000.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.