APA

Philips J., . (2018). PMP Project Management Professional. New York: Mc Graw Hill.

Chicago

Philips John, . 2018. PMP Project Management Professional. New York: Mc Graw Hill.

Harvard

Philips J., . (2018). PMP Project Management Professional. New York: Mc Graw Hill.

MLA

Philips John, . PMP Project Management Professional. New York: Mc Graw Hill. 2018.