Put quotation marks around any sentences, phrases or distinctive/unusual terms taken word-for-word from the source material.
A direct quotation is usually blended into your own text:
EXAMPLE: Brownlee argues that “captive animals must be allowed to serve as ambassadors for their species”(72).
Quoting more than 3 lines?
Summary and paraphrase are terms often used interchangeably -- that is, as synonyms. They refer, however, to somewhat different activities. A paraphrase, like a summary, is a nonevaluative restatement of someone's writing.... The goal of a paraphrase is to represent accurately, but in simpler words and sentences, the work in question. (32)