Philips, J. (2018). PMP Project Management Professional: Study Guide (fifth.). Mc Graw Hill.
Chicago-referens (17:e uppl.)Philips, John. PMP Project Management Professional: Study Guide. fifth. New York: Mc Graw Hill, 2018.
MLA-referens (9:e uppl.)Philips, John. PMP Project Management Professional: Study Guide. fifth. Mc Graw Hill, 2018.