Project Management Institute. (2017). PMBOK guide. Chicago, IL: Project Management Institute.
Dyfyniad Arddull ChicagoProject Management Institute. PMBOK Guide. Chicago, IL: Project Management Institute, 2017.
Dyfyniad MLAProject Management Institute. PMBOK Guide. Chicago, IL: Project Management Institute, 2017.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.