If you are collecting your data by using online means then you need to double-check the authenticity of a domain. You need to examine the three letters after the domain name, for example, “edu” (educational), “gov” (government), “org” and (nonprofit). These three are considered authentic sources while you should not quote a source from “com” (commercial) as it is not considered authentic. However, you can quote a news article published on a “com” website as those are considered reliable.