United nations. (2013). A Guide to the Project Management Body of Knowledge project management institute (5.). library of Congress.
Чикаго-гийн эшлэл (17 дахь хэвлэлт)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. United States of America: library of Congress, 2013.
MLA -ийн эшлэл (9 дэх хэвлэлт)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. library of Congress, 2013.