School mathematics study group. (1959). Junior High School Mathematics Units: Volume I, Number Systems ; Commentary for Teachers. Yale University.
Lua i Stíl Chicago (17ú heag.)School mathematics study group. Junior High School Mathematics Units: Volume I, Number Systems ; Commentary for Teachers. Connecticut: Yale University, 1959.
Lua MLA (9ú heag.)School mathematics study group. Junior High School Mathematics Units: Volume I, Number Systems ; Commentary for Teachers. Yale University, 1959.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.