1. Natanson, M. and Johnstone, Henry W. Jr., eds. 1965.Philosophy, Rhetoric and Argumentation, 126–34. 135–37. University Park: The Pennsylvania State University Press.
2. Johnstone, H. W. Jr. 1978.Validity and Rhetoric in Philosophical Argument, 86–92. University Park, PA: The Dialogue Press of Man & World.
3. 1963.La théorie de l'argumentation, perspectives et applications, 571–80. Louvain: Nauwelaerts.
4. Perelman's new rhetoric