Your St. Martin’s Guide includes citation styles for APA, MLA, and other popular citation conventions. Here’s the MLA style for print newspapers:
30. ARTICLE IN A NEWSPAPER Include the edition (if listed) and the section number or letter (if listed).
Bernstein, Nina. “On Lucille Avenue, the Immigration Debate.” New York Times 26 June 2006, late ed.: A1+. Print.
For the online version:
38. ARTICLE IN AN ONLINE NEWSPAPER After the name of the newspaper, give the publisher, publication date, medium(Web), and access date.
Bustillo, Miguel, and Carol J. Williams. “Old Guard in Cuba Keeps Reins.” Los Angeles Times. Los Angeles Times, 25 Feb. 2008. Web. 26 Feb.2010.