“Estoppel: A New Justification for Individual Rights,” Reason Papers No. 17 (Fall 1992), p. 61–74
- evaluation by anonymous reviewer
- audio version at KOL042
- The Genesis of Estoppel: My Libertarian Rights Theory (Mar. 22, 2016)
- “Punishment and Proportionality: The Estoppel Approach,” Journal of Libertarian Studies 12, no. 1 (Spring 1996): 51–73
- Defending Argumentation Ethics: Reply to Murphy & Callahan, Anti-state.com (Sept. 19, 2002)
- “A Libertarian Theory of Punishment and Rights,” Loy. L.A. L. Rev. 30, no. 2 (Jan. 1997): 607-45
- “New Rationalist Directions in Libertarian Rights Theory,”Journal of Libertarian Studies 12:2 (Fall 1996) 313–26
- superseded by “Dialogical Arguments for Libertarian Rights,” in The Dialectics of Liberty (Lexington Books, 2019)
