Citing for research papers
Descriptions on how to site for MLA, APA, Chicago Style
The following must be cited in a research paper
Statistics (not dates)
Ideas taken from an author. In this case - you are not to copy word for word. That is plagiarism. However, when you take information from a source and paraphrase it in your own words, you need to credit the author with the his/her thoughts that you rephrased from the source into your paper.