United nations. (2013). A Guide to the Project Management Body of Knowledge project management institute (5.). library of Congress.
Citazione stile Chigago Style (17a edizione)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. United States of America: library of Congress, 2013.
Citatione MLA (9a ed.)United nations. A Guide to the Project Management Body of Knowledge Project Management Institute. 5. library of Congress, 2013.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.