Oh, and while I’m at it, I should definitely offer a link to a later article that considers the relationship of pragmatics to rhetoric:
Liu, Y., & Zhu, C. (2011). Rhetoric as the Antistrophos of pragmatics: Toward a “Competition of Cooperation” in the study of language use. Journal of Pragmatics, 43(14), 3403–3415. doi:10.1016/j.pragma.2011.07.010