Não informado. (1970). Journal for Research in Mathematics Education. National Council of Teachers of Mathematics.
Cita Chicago Style (17a ed.)Não informado. Journal for Research in Mathematics Education. Reston, Va: National Council of Teachers of Mathematics, 1970.
Cita MLA (8a ed.)Não informado. Journal for Research in Mathematics Education. National Council of Teachers of Mathematics, 1970.
Precaución: Estas citas no son 100% exactas.