Sources of information refers to helping tools we use in our day to day research.These sources helps to show the credibility about our search results,let the lecturer know we actually understand what we're writing on and at the same time give more explanation to our research.
When citing sources during research,it is necessary to give accolades to our references and not make it seem like our own to avoid plagiarism.Sources can be found in a literature text, movie expert and so many other ways.