APA
(2017). A Guide to the project management body of knowledge.-6th ed. Project Management Institute: Pennsylvania.
Chicago
2017. A Guide to the project management body of knowledge.-6th ed. Project Management Institute: Pennsylvania.
Harvard
(2017). A Guide to the project management body of knowledge.-6th ed. Project Management Institute: Pennsylvania.
MLA
A Guide to the project management body of knowledge.-6th ed. Project Management Institute: Pennsylvania. 2017.