An individual you list as a reference is just as important as the information that goes into your cover letter and resume. The individuals you select should be able to speak to your individual character and potential value as an employee. In addition to obtaining letters of reference from these individuals, inform them that you have submitted their name to a potential employer as a reference; this way they'll be prepared if contacted. Also, if you are unsure about nominating an individual as a reference, seek his or her permission first.