Internet Encyclopedia of Philosophy (n.d.)
- Language
- English
- Alternative url
- https://www.iep.utm.edu/
- “Square of Opposition.” n.d. (0 diagrams)
- Groarke, Louis F. n.d. “Aristotle: Logic.” (0 diagrams)
- Lenzen, Wolfgang. n.d. “Leibniz: Logic.” (0 diagrams)
- Humphreys, Justin. n.d. “Aristotle (384 B.C.E.-322 B.C.E.).” (0 diagrams)
- Demey, Lorenz, and Hans Smessaert. 2016. “Duality in Logic and Language.” (7 diagrams)