Van Bon, J. (2011). ITIL 2011 edition: A pocket guide. Van Haren Publishing.
Lua i Stíl Chicago (17ú heag.)Van Bon, Jan. ITIL 2011 Edition: A Pocket Guide. Zaltbommel, Netherlands: Van Haren Publishing, 2011.
Lua MLA (9ú heag.)Van Bon, Jan. ITIL 2011 Edition: A Pocket Guide. Van Haren Publishing, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.