Brewster Ernest. (2011). IT Service Management. Viva Books.
Lua i Stíl Chicago (17ú heag.)Brewster Ernest. IT Service Management. New Delhi: Viva Books, 2011.
Lua MLA (9ú heag.)Brewster Ernest. IT Service Management. Viva Books, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.