Using another person's words or ideas without giving credit to the original source is plagiarism - a violation of academic honesty that can be punished by a failing course grade.
The best way to avoid plagiarism is to give credit for quotes or paraphrased ideas using an accepted citation style.
APA CITATION STYLE See any of these links for basic introductions to APA Citations.
Check this sample paper with notes about formatting and style. If you are writing with Microsoft Office, see this video showing How to Format an APA Paper.
