Não informado. (1970). Journal for Research in Mathematics Education. National Council of Teachers of Mathematics.
Παραπομπή σε μορφή Chicago (17η εκδ.)Não informado. Journal for Research in Mathematics Education. Reston, Va: National Council of Teachers of Mathematics, 1970.
Παραπομπή σε μορφή MLA (8th εκδ.)Não informado. Journal for Research in Mathematics Education. National Council of Teachers of Mathematics, 1970.
Πρόσοχή: Οι παραπομπές μπορεί να μην είναι 100% ακριβείς.