Hájek, P.; Paris, J.; Shepherdson, J. (Mar 2000). "The Liar Paradox and Fuzzy Logic". The Journal of Symbolic Logic. 61 (1): 339–346. doi:10.2307/2586541. JSTOR2586541. S2CID6865763.
Kripke, Saul (1975-11-06). Outline of a theory of truth. Seventy-Second Annual Meeting American Philosophical Association, Eastern Division. Vol. 72. Journal of Philosophy. pp. 690–716. doi:10.2307/2024634. JSTOR2024634.
Glanzberg, Michael (2015-06-17). "Complexity and Hierarchy in Truth Predicates". Unifying the Philosophy of Truth. Logic, Epistemology, and the Unity of Science. Vol. 36. Dordrecht: Springer. pp. 211–243. doi:10.1007/978-94-017-9673-6_10. ISBN978-94-017-9672-9.
Hájek, P.; Paris, J.; Shepherdson, J. (Mar 2000). "The Liar Paradox and Fuzzy Logic". The Journal of Symbolic Logic. 61 (1): 339–346. doi:10.2307/2586541. JSTOR2586541. S2CID6865763.
Kripke, Saul (1975-11-06). Outline of a theory of truth. Seventy-Second Annual Meeting American Philosophical Association, Eastern Division. Vol. 72. Journal of Philosophy. pp. 690–716. doi:10.2307/2024634. JSTOR2024634.
Hájek, P.; Paris, J.; Shepherdson, J. (Mar 2000). "The Liar Paradox and Fuzzy Logic". The Journal of Symbolic Logic. 61 (1): 339–346. doi:10.2307/2586541. JSTOR2586541. S2CID6865763.