DWYER, R. C., & ELLIGETT, J. K. (1970). Natural mathematics: Teaching children through. Parker Pub.
Chicago-čujuhus (17. p.)DWYER, Robert C., juo Jane K. ELLIGETT. Natural Mathematics: Teaching Children Through. New York: Parker Pub, 1970.
MLA-čujuhus (9. p.)DWYER, Robert C., juo Jane K. ELLIGETT. Natural Mathematics: Teaching Children Through. Parker Pub, 1970.
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