FOUR WORLDS OF WRITING, By Janice M. Lauer, Gene Montague, Andrea Lunsford, and Janet Emig (New York: Harper and Row, 1981, xvii + 423 pp.) REINVENTING THE RHETORICAL TRADITION, ed. Aviva Freedman and Ian Pringle (Conway, Arkansas: L & S Books, for the Canadian Council of Teachers of English, 1980, 197 pp.) UNDERSTANDING PERSUASION. By Raymond S. Ross and Mark G. Ross (Englewood Cliffs, New Jersey: Prentice‐Hall, 1981, xii+228 pp.)