Morris, H., & Gallacher, L. (2012). ITIL foundation exam study guide. Wiley.
Lua i Stíl Chicago (17ú heag.)Morris, Helen, agus Liz Gallacher. ITIL Foundation Exam Study Guide. Chichester, U.K.: Wiley, 2012.
Lua MLA (9ú heag.)Morris, Helen, agus Liz Gallacher. ITIL Foundation Exam Study Guide. Wiley, 2012.
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