Béziau, Jean-Yves and Basti, Gianfranco, eds. 2017a. The Square of Opposition: A Cornerstone of Thought. Studies in Universal Logic. Basel: Birkhäuser.
Béziau, Jean-Yves and Basti, Gianfranco. 2017b. “The Square of Opposition: A Cornerstone of Thought.” in The Square of Opposition: A Cornerstone of Thought, edited by Jean-Yves Béziau and Gianfranco Basti, pp. 3–12. Studies in Universal Logic. Basel: Birkhäuser.