The purpose of citing sources is to give credit to the authors or the sources you use, to give credibility to the facts you state, and to enable anyone who uses your work to locate these sources and determine their validity. This makes it very important to include accurate information and double check your citations.
It is also important that citations be uniform in style so that readers can properly interpret their meaning. Citation styles vary. The important thing is that whichever citation style is used, it is applied consistently and uniformly. The Modern Language Association (MLA), the American Psychological Association (APA), and the Chicago Manual Style (CMS) are three of the style manuals used on many college campuses. Other styles may be required by specific disciplines.