Agutter, C. (2019). ITIL foundation essentials: ITIL 4 edition : the ultimate revision guide (Second edition.). IT Governance Publishing.
Chicago-Zitierstil (17. Ausg.)Agutter, Claire. ITIL Foundation Essentials: ITIL 4 Edition : The Ultimate Revision Guide. Second edition. Ely, Cambridgeshire, United Kingdom: IT Governance Publishing, 2019.
MLA-Zitierstil (9. Ausg.)Agutter, Claire. ITIL Foundation Essentials: ITIL 4 Edition : The Ultimate Revision Guide. Second edition. IT Governance Publishing, 2019.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.