Angel, G. G. (2010). PMP certification: A beginner's guide. New York: McGraw-Hill.
Trích dẫn kiểu ChicagoAngel, George G. PMP Certification: A Beginner's Guide. New York: McGraw-Hill, 2010.
Deismireacht MLAAngel, George G. PMP Certification: A Beginner's Guide. New York: McGraw-Hill, 2010.
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