Is a theory or theories from reputable sources that may form
the basis of the research in developing foundations for his/her
research.
I site mo lng yung ginawa mong research as existing reputable research meron isang part dun ng research niya na mag papatibay sa gingawa mong research. para hindi sabhin tsismis lang and gingawa mo, tulad nung nagsabi na ang history ay chismis lang. example: