Unesco & Morris, R. (1986). Studies in mathematics education, volume 5: Teaching of geometry. Unesco.
Chicago-viite (17. p.)Unesco ja Robert Morris. Studies in Mathematics Education, Volume 5: Teaching of Geometry. Paris: Unesco, 1986.
MLA-viite (9. p.)Unesco ja Robert Morris. Studies in Mathematics Education, Volume 5: Teaching of Geometry. Unesco, 1986.
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