General Documentation Information
Documenting sources at the end of the research paper consists of listing all of the sources from which you quoted, paraphrased, or summarized. If you didn't quote, paraphrase, or summarize from a source (that is, if you merely read a source as background and didn't actually use its information in your paper), you cannot list it at the end.
Why list your sources? A person who reads your research paper may want to go to your original sources for more information on a topic. Your reader also may want to assess the quality of the information in your research paper by reviewing the dates of your sources and their type of publication (general interest magazines vs. specialized journals, for example). Finally and most importantly, listing your sources gives full credit to the authors of the sources' ideas and information. 
