The literature you review should mainly be from peer-reviewed academic journals(such as the International Journal of Project Management and the ProjectManagement Journal), and books based on peer-reviewed academic research (suchas Winch, 2010 and Morris, 2013) published by Wiley-Blackwell, Mcgraw-Hill, Pearsonand other academic publishers. You will find industry reports also helpful for contextualinformation. You may quote the occasional practical example from the trade presswhere appropriate, but seek to keep this to a minimum for a theoretical paper such asthis. You should not use unsupported quotes from sources such as blogs or Wikipedia.