Even if you paraphrase or put something into your own words, you still need to cite the original source.
To avoid plagiarizing someone else words or ideas, make sure you:
Created specifically for UIW graduate students, this tutorial includes UIW's guidelines and possible disciplinary response to plagiarism
Created by the Vaughan Memorial Library at Acadia University, this tutorial suggests that researching ethically is also researching efficiently. You will not only learn how to avoid plagiarism, but you’ll also pick up some good research tips too.