DUNCAN, E. R. (1972). Modern school mathematics structure and use. Houghton Mifflin co.
Chicago-čujuhus (17. p.)DUNCAN, Ernest R. Modern School Mathematics Structure and Use. Boston: Houghton Mifflin co, 1972.
MLA-čujuhus (9. p.)DUNCAN, Ernest R. Modern School Mathematics Structure and Use. Houghton Mifflin co, 1972.
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