This quote from the Purdue OWL defines quotations:
"Quotations must be identical to the original, using a narrow segment of the source. They must match the source document word for word and must be attributed to the original author" (Driscoll and Brizee).
Driscoll, Dana Lynn, and Allen Brizee. "Quoting, Paraphrasing, and Summarizing." The Purdue OWL Family of Sites. The Writing Lab and OWL at Purdue and Purdue University, 2013. Web. 1 July 2015.
