Asghari, Seyyed Amir Hossein (2012). “Language, Plato and his predecessors”, Journal of Information of Wisdom and Knowledge, Vol. 7, No. 9, pp. 22-23. [In Persian]
Barber, Alex and Robert J. Stainton (ed.) (2009). Concise Encyclopedia of Philosophy of Language and Linguistics. Elsevier.
Foroughi, Mohammad Ali (2004). The Way of Wisdom in Europe, Tehran: Hermes Publishing. [In Persian]
Frege, Gottlob (1968). The Foundation of Arithmetic, Tr. Austin. Oxford: Blackwell.
Frege, Gottlob (1972). Conceptual Notation, Edited and Tr. By T.W. Bynum. Oxford: Oxford University Press.
Frege, Gottlob (1989). Philosophical and Mathematical Correspondence, Oxford: Blackwell.
Ibn Sina, Hossein Ibn Abdullah (???). Al-Shifa, Presented and researched by: Ibrahim Madkur, Cairo. [In Persian]
McKeon, Richard (1946). “Aristotle’s Conception of Language and the Arts of Language”, Classical Philology, Vol. 41, No. 4, pp. 193-206.
Mendelsohn, Richard L. (2005). The Philosophy of Gottlob Frege, New York: Cambridge University Press.
Movahed, Zia (1997). “Fundamental Differences between Old and New Logic”, Mofid Letter, No. 10, pp. 69-79. [In Persian]
Muzaffar, Mohammad Reza (2006). Al-Mantaq, Qom: Dar Al-Alam Publication. [In Persian]
Noonan, Harold W. (2001). Frege, A Critical Introduction, Cambridge: Polity.
Rein, Andrew (1985). “Frege and Natural Language”, Philosophy, Vol. 60, No. 234, pp. 513-524.
Sullivan, Arthur (ed.) (2003). Logicism and the Philosophy of Language: Selection from Frege and Russell, Mississauga: Broadview Press.
Weiner, Joan (2005). Frege Explained: from Arithmetic to Analytic Philosophy, Illinois: Open Court.