It should show evidence of study of the essential readings for the relevant topic, as well as sources such as:
on-line books from the Staffs Uni Library
books from your Services Library
articles in electronic academic journals
articles in newspapers or news magazines for recent examples to support your arguments and case studies
reputable websites (e.g. Chatham House, SIPRI, Brookings Institute, Carnegie Endowment for International Peace, Center for Strategic and International Studies, etc.)