Chalmers, David J. 2004. The foundations of two-dimensional semantics. In Two-Dimensional Semantics: Foundations and Applications, edited by M. Garcia-Carpintero and M. Macia. Oxford: Oxford University Press.
Church, Alonzo. 1951. A formulation of the logic of sense and denotation. In Structure, Method, and Meaning, edited by P. Henle, H. M. Kallen and S. K. Langer. New York: Liberal Arts Press.
Frege, Gottlob. 1893. On sense and reference. In Translations from the Philosophical Writings of Gottlob Frege, edited by P. Geach and M. Black. Translated by M. Black. Oxford: Blackwell, 1952.
Frege, Gottlob. 1879. Begriffsschrift. A formula language of pure thought modelled on that of arithmetic. In The Frege Reader, edited and translated by M. Beaney. Oxford: Blackwell, 1997.
Noonan, Harold W. 1986. (Untitled) review of Understanding Identity Statements by Thomas V. Morris. Philosophical Quarterly 36(144): 457-459.10.2307/2220206
Soames, Scott. 1989. Direct reference and propositional attitudes. In Themes from Kaplan, edited by J. Almog, J. Perry and H. Wettstein. Oxford: Oxford University Press.
Soames, Scott. 2002. Beyond Rigidity: The Uninished Semantic Agenda of Naming and Necessity. New York, NY: Oxford University Press.10.1093/0195145283.003.0001