Internet materials can be ranked from unreliable to very reliable depending on their sources and the quality of their publication processes. A good researcher distinguishes the most effective types of sources from the others. Peer-reviewed sources are regarded as the strongest, implying that the published paper has been reviewed by authorities in their fields and appreciated for the quality of the methods adopted in the paper. Thus, the literature reviewer should be careful about the sources they prefer. In this sense, websites of an individual, who is not an expert on the issue can be considered as an unreliable source.