Cita APA (7th ed.)

Morris, H., & Gallacher, L. (2012). ITIL foundation exam study guide. Wiley.

Cita Chicago (17th ed.)

Morris, Helen, i Liz Gallacher. ITIL Foundation Exam Study Guide. Chichester, U.K.: Wiley, 2012.

Cita MLA (9th ed.)

Morris, Helen, i Liz Gallacher. ITIL Foundation Exam Study Guide. Wiley, 2012.