Não informado. (1970). Journal for Research in Mathematics Education. National Council of Teachers of Mathematics.
Citação do estilo Chicago (17ª ed.)Não informado. Journal for Research in Mathematics Education. Reston, Va: National Council of Teachers of Mathematics, 1970.
Citação MLA (8ª ed.)Não informado. Journal for Research in Mathematics Education. National Council of Teachers of Mathematics, 1970.
Предупреждение: эти цитированмия не могут быть всегда правильны на 100%.