Não informado. (1970). Journal for Research in Mathematics Education. National Council of Teachers of Mathematics.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal for Research in Mathematics Education. Reston, Va: National Council of Teachers of Mathematics, 1970.
Lua MLA (8ú heag.)Não informado. Journal for Research in Mathematics Education. National Council of Teachers of Mathematics, 1970.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.