References allow the reader to look up information and read more about particular phenomena or research that was discussed in the current study. While reading the study, the quality of the references should be considered. If, for instance, a study uses research from unprofessional or questionable sources, the validity of his arguments will also be questionable. Look for journals that are known and respected in the profession as this will help to determine the strength of the supporting material that led to the development of the original theory.