You must always cite information you use from other sources for the following reasons:
1. You need to let the reader or your instructor know the original source of information. Citing sources strengthens your paper and lets your instructor know that you did the work.
2. Citing is a service to the reader. The reader may be stimulated by a reference you have used in your works cited page and will be able to identify and access the sources you have used for his/her own use.
3. You want to give credit to the person whose ideas you have used.
There are two places where you need to cite information: a) in the body of your paper and b) at the end of your paper in a list of sources known as a bibliography or a works cited page or a list of references.