Yes, when citing a directly quoted word-for-word source in a paper, you should use quotation marks to indicate that the text is not your own. This is important for avoiding plagiarism and giving credit to the original author. The quotation marks should be placed at the beginning and end of the quoted text, and any additional punctuation (such as commas or periods) should be placed inside the quotation marks. For example:
"The author states that 'plagiarism is the act of taking someone else's work and passing it off as your own'" (Smith, 2020).
In this example, the quotation marks are used to indicate that the text "plagiarism is the act of taking someone else's work and passing it off as your own" is a direct quote from the author Smith (2020).