Edward A. Hacker (°1930, †2020)
- Parry, William T., and Edward A. Hacker. 1991. Aristotelian Logic. Albany, NY: State University of New York Press. (8 diagrams)
- Hacker, Edward A. 1975. “The Octagon of Opposition.” Notre Dame Journal of Formal Logic 16 (3): 352–353. (1 diagram)