When citing word for word then you must use quotation marks. See the following example.
If machines are to think, they must "at the very least be able to do thinking-related things humans can do" (Nilsson 47).
When your quote is longer than four lines: • Start the quote on a new line. • Indent the entire quote by ten spaces (two tabs). • Don't use quotation marks. • Double-space the entire quote (just like the rest of the paper). • If your quote contains a quote, use double quotation marks (" ") around the original quote.