Brewster Ernest. (2011). IT Service Management. Viva Books.
Chicago-čujuhus (17. p.)Brewster Ernest. IT Service Management. New Delhi: Viva Books, 2011.
MLA-čujuhus (9. p.)Brewster Ernest. IT Service Management. Viva Books, 2011.
Muitte dárkkistit čujuhemiid riektatvuođa, ovdal go geavahat daid iežat deavsttas.