* "Stone Spaces": A seminal work on Stone duality, a key concept in topology and logic.
* "Topos Theory": A comprehensive treatise on topos theory, a powerful generalization of set theory with applications in logic, geometry, and physics.
* "Sketches of an Elephant: A Topos Theory Compendium": A multi-volume work providing a detailed and comprehensive overview of topos theory.
* "Notes on Logic and Set Theory": A collection of notes covering foundational topics in logic and set theory.
In addition to these major works, Johnstone has also written numerous research papers on category theory, topos theory, and related subjects.
It's important to note that there might be other authors with similar names, so to be completely certain, it's always best to verify the author's full name and any other relevant identifying information.