Concepts

Bolton, Neil
[1977]  Concept Formation,  Pergamon Press, Oxford

Bruner, Jerome S. ; Jacqueline J. Goodnow and George A. Austin
[1956]  A Study of Thinking, Science Editions, New York, 1966

Caws, Peter
[1965]  The Philosophy of Science, D. Van Nostrand, Princeton, New Jersey

Kaplan, Abraham
[1964]  The Conduct of Inquiry. Methodology for Behavioral Science, Chandler Publishing Company, Scranton, Pennsylvania

Nachmias, Chava Frankfort & David Nachmias
[1992]  Research Methods in the Social Sciences, Edward Arnold, London, Fourth Edition  [Chapter II]

Reynolds, Paul Davidson
[1971]  A Primer in Theory Construction, Macmillan Publishing Co., New York, 1986

Schon, Donald A.
[1963]  Displacement of Concepts, Tavistock Publications, London

Sternberg, Robert J. and Edward E. Smith, editors
[1988]  The Psychology of Human Thought, Cambridge University Press, Cambridge

Trusted, Jennifer
[1987]  Inquiry and Understanding, An Introduction to Explanation in the Physical and Human Sciences, Macmillan, London

Van Dalen, Deobold B.
[1962]  Understanding Educational Research. An Introduction, Mc-Graw-Hill Book Co., New York, 1979  [Chapter III]

Vygotsky, L. S.
[1934, First Russian Edition]  Thought and Language, The Mit Press, Cambridge, Massachusetts, 1996