Your research project relies in part upon the work others. Therefore, you must cite their sources of information. It means you not only to give credit where it is due, but also to provide the reader with access to these sources. In addition to, the reference must be documented systematically and unobtrusively.

In general, cite only significant published references. Follow the journal’s instructions for documentation, which will be some version of the author-date system, the number system, or a combination of the two.