If You Didn't Write It, Cite It

In the best interest of giving credit where credit is due and to reduce the chance you plagiarize someone else's work, cite whatever you did not write yourself and quote the original author directly. And cite all records you use in your research--otherwise you will have no idea where the information was obtained. Was it from a reliable record or was it written on the back of a dime store receipt you found in Grandma's bible?