This bibliography has works on style in general, including levels of style, and anything about the canon of style that cannot be categorized under particular tropes and schemes.
Burke, Kenneth. "Appendix D: Four Master Tropes." A Grammar of Motives. Berkeley: U of California P, 1969. 503-517.
Corbett, Edward P. J. and Robert J. Connors. Classical Rhetoric for the Modern Student. 4th ed. New York: Oxford UP, 1999.
Frye, Northrop. Anatomy of Criticism: Four Essays. Princeton: Princeton UP, 1957.
Lanham, Richard A. A Handlist of Rhetorical Terms. 2nd ed. Berkeley: University of California Press, 1991.
Pepper, Stephen C. World Hypotheses: A Study in Evidence. Berkeley: U of California P, 1948.
White, Hayden V. Metahistory: The Historical Imagination in Nineteenth-Century Europe. Baltimore: Johns Hopkins UP, 1973.
Winslow, Russell. "On Mimetic Style in Plato's Republic." Philosophy & Rhetoric 45/1 (2012): 46-64.