United nations. (2013). A Guide to the Project Management Body of Knowledge project management institute (5.). library of Congress.
Chicago-viite (17. p.)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. United States of America: library of Congress, 2013.
MLA-viite (9. p.)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. library of Congress, 2013.
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