If you found your article/book in OneSearch, there is a citation tool on the right toolbar!
Click "Cite" while viewing the material, select your citation style at the top, and copy and paste into your paper's references.
Remember to double check the citation for accuracy!
Plagiarism is the practice of taking someone else's work or ideas and passing them off as one's own.
Here are a couple of additional links to help you avoid doing it.