Sproull Bob. (2018). Problem Solving, Problem Prevention and Decision Making Guide. Routledge.
Chicago-čujuhus (17. p.)Sproull Bob. Problem Solving, Problem Prevention and Decision Making Guide. Routledge, 2018.
MLA-čujuhus (9. p.)Sproull Bob. Problem Solving, Problem Prevention and Decision Making Guide. Routledge, 2018.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.