Written by Mariel Lorenz This guide for APA was adapted from: Hacker, D. (2003). how to write an economics paper introduction A Writer' Reference. (5th ed.). Boston: St. Martin's. American Psychological Association. (2001). Publication Manual of the American Psychological Association. (5th ed.). Washington, DC: American Psychological Association. Updated January 28, 2005 by Renee Brown APA Style does not provide guidelines for formatting the