منابع:
1- Baker G.P. S., "Frege: Logical Excavations" 2nd. ed., Oxford, Basil Blachwell, 1984
2- Currie Gregory, "Frege: An Introduction to his Philosophy", Brighton, Sussex, Harvester Press., 1982
3- Diller Antoni, "Onthe Sense of Unsaturated Expression" Philosophical Papers, vol. 22, 1993
4- Dummett Michael, "Frege: philosophy of languags" 2nd.ed, london,Duckworth, 1973.
5- Dummett Michael, "The Interpretation of Frege's Philosophy", 1st. ed., US., HUP, 1981
6- Frege Gottlob, 1891, "Function and Concept", in "Translations from the Philosophical Writings of Gottlab Frege", 3rd.ed, eds, Geach, P., T., & Black M.Basil Blaclwell, Oxford, 1952.
7- Frege Gottbol, 1891-2, "Comments on Sinn and Bedeutung", in "Posthumous Writings", 1st prt., eds. Hans Hermes, Fridrich Kaulbach, trans. Peter Long&Roger White, Basil Blackwell, Oxford, 1979.
8- Frege Gottlob, 1893, "The Basic Laws of Arithmetic", Vol.1, 2nd. prt., teans. & ed.Furth M., US.,University of California Press., 1964.
9- Frege Gottlob, 1897, Logic , in "Posthumous Writings", 1 st prt., eds. Hans Hermes, Friedrich Kambartel, Friedrich Kaulbach, trans. Peter Long& Roger White, Basil Blackwell, Oxford, 1979.
10- Frege Gottlob, 1904, "What is a Function", in "Translations from the Philosophical Writings of Gottlab Frege", 3rd.ed, eds, Geach, P., T., & Black M.Basil Blaclwell, Oxford, 1952.
11- Frege Gottlob, 1906, "Introduction to Logic", in "Posthumous Writings", 1st prt., eds. Hans ermes, Fridrich Kaulbach, trans. Peter Long&Roger White, Basil Blackwell, Oxford, 1979.
12- Frege Gottlob, 1914, "Logic in Mathematics", in "Posthumous Writings", 1st prt., eds. Hans Hermes, Fridrich Kaulbach, trans. Peter Long&Roger White, Basil Blackwell, Oxford, 1979.
13- Frege Gottlob, 1918, "Thought" in "Logical Investigations", 1st pub., ed.Geach P.T., trans. Geach P.T. Yale University Press.,New Haven, 1977.
14- reprinted as "The Thought: A Logical Linquiry" in "Philosophival Logic", trans. Quinton A.M&M.,6th prt.,ed. Strawson P.F., OUP., Oxford, 1967.
15- reprinted in "Essays on Frege".2nd. prt., ed., Klemke E D., University of LLLinols Press., US., 1968.
16- Frege Gottlob, 1919, "Notes for Ludwig Darnstaedter", in "Posthumous Writings", 1st prt., eds. Hans Hermes, Friedrich Kambartel, Friedrich Kaulbach, trans. Peter Long&Roger White, Basil Blackwell, Oxford, 1979.
17- Frege Gottlob, 1923, "Compound Thoughts", in "Logical Investigations", 1st. pub., ed.Geach P.T., trans. Stoothoff R.H., Yale University Press.,New Haven, 1977.
18- Frege Gottlob, "Philosophical and Mathematical correspondence", 1st. pub., eds. Gottfried Gabriol, Hans Hermes, Friedrich Kambartel, Christian Thiel, Albert Veraart, Trans Hans. Kaal, Basil Blackwell, Oxford, 1980.
19- Furth Montgomery, 1968, "Two Types of Denotation", in "Sense and Reference in Frege's Philosophy", vol.3, 1st. prt., ed. Sluga H., Garland Punlishing Inc., US., 1993.
20- Geach, P.T., "Review of Frege: Philosophy of Language", Mind,vol. 85, 1976.
21- Grassmann Reinhard, "Reflections on Frege's Philosophy", US., Northwestern University press., 1969.
22- Klement Kevin C., "Frege on the sense of function Expressions",http://www.unix.oit.umass .edu/ آ Klement/functionsense.html,2000.
23- Kluge E.H.W., "The Metaphysics of Gottlob Frege, An Essay in Ontological Reconstruction", Canada, Martinus Nijhoff Publishers, 1980.
24- Marshall William, "Frege's Theory of Functions and Objects", The Philosophical Review, No. 62, 1953.
