AGUTTER, Claire. ITIL® Foundation Essentials - ITIL 4 Edition: the Ultimate Revision Guide. 2nd ed. Ely: IT Governance, 2019. ISBN 9781787781184. Dostupné také z: https://proxy.k.utb.cz/login?url=https://app.knovel.com/hotlink/toc/id:kpITILFEI2/itil-foundation-essentials?kpromoter=marc.