Não informado. (1971). Mathematics in School. Mathematical Association.
Lua i Stíl Chicago (17ú heag.)Não informado. Mathematics in School. London: Mathematical Association, 1971.
Lua MLA (8ú heag.)Não informado. Mathematics in School. Mathematical Association, 1971.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.