Gaya APA

Heerkens.--, G, R, H, G, R. (2005). Project Management 24 lesson to help you master any project the employee handbook for enhancing corporate performance.-- . USA : McGrawHill.

Gaya MLA

Heerkens.--, Gary, R., Heerkens.--, Gary, R.. "Project Management 24 lesson to help you master any project the employee handbook for enhancing corporate performance.--". USA : McGrawHill, 2005. Buku.