Here are a few OER titles in Classical Rhetoric. Many of these are required readings in classical rhetoric courses, as they are foundational texts in rhetoric.  Demetrius - On Style Longinus - On the Sublime Plato - Gorgias Plato - Phaedrus Cicero - Oratory Cicero - De Inventione Quintillian - The Institutes of Oratory Rhetorica Ad Herennium - Unknown (attributed to Cicero) I think that my favorites are the Quintillian and the Rhetorica Ad Herennium. Many facets of these texts inform Edward PJ Corbett's Classical Rhetoric for the Modern Student and Richard Lanham's A Handlist of Rhetorical Terms , which are exquisite and exceptional texts with regard to the study of rhetoric.  

I love finding older books on rhetoric and composition. I love noticing the shift in the paradigms and the orientations. Here are a few classic titles. Many of these titles are almost in the public domain. Enjoy! Strunk & White - Elements of Style  (*) Richard Weaver - The Ethics of Rhetoric Stratton D. Brooks & Marietta Hubbard - Composition-Rhetoric Thomas Wood - Practice Grammar & Composition G.H. Armstrong - English Grammar and Composition for Public School Edwin Abbott - How to Write Clearly: Rules and Exercises on English Composition Dorothy Canfield Fisher & George R. Carpenter - Elementary Composition (*) I teach many of the principles in this book today. I known many law schools, business programs, and humanist departments who regard this book as the gospel of writing style. Many of the stylistic techniques described in this book hold up well.