You need to look for a topic (sources of internal and external knowledge)
The way is an example: (aLLHIDDAN, 2010) Internal and External Knowledge Sources:
(Al-Harbi ,2010) mentioned the internal and external knowledge sources:
All the same way from different sources of six or more English sources, with the inclusion of the link in the references and it is necessary to be a PDF
Add an introduction and an end to the subject.