1. Anderson, A., and N. Belnap. 1975. Entailment: The Logic of Relevance and Necessity I. Princeton: Princeton University Press.
2. Topics of Thought
3. Knowability Relative to Information
4. Impossible Worlds
5. Berto, F., and M. Jago. 2023. “Impossible Worlds.” In The Stanford Encyclopedia of Philosophy, edited by E. N. Zalta and U. Nodelman. Metaphysics Research Lab, Stanford University. https://plato.stanford.edu/entries/impossible-worlds/.