Willerding, M. F. (1966). Elementary mathematics: Its structure and concepts. Wiley.
Chicago-viite (17. p.)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. New York: Wiley, 1966.
MLA-viite (9. p.)Willerding, Margaret F. Elementary Mathematics: Its Structure and Concepts. Wiley, 1966.
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