My Topic is a:- a comparison of authentication mechanisms

 Research topic.  You must  include at least four primary, peer-reviewed sources in your  bibliography.  Additional sources of varying standards can also be used.   However, these four must be specifically cited.  An un-cited source  should not appear in your bibliography.

A primary source is the original material. If you are directly  quoting the words of an author, that is usually a primary source.  However, if you are quoting a paraphrase from an author (known because  the author is making a citation), then you should find the original  document they are paraphrasing and then quote or paraphrase the  original.