Walsh, J. (1987). The manager`s problem solver. Spherell.
Chicago-čujuhus (17. p.)Walsh, John. The Manager`s Problem Solver. London: Spherell, 1987.
MLA-čujuhus (9. p.)Walsh, John. The Manager`s Problem Solver. Spherell, 1987.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.