Barrieta, E. J. (1975). Mathematical competencies of grade one entrants.
Lua i Stíl Chicago (17ú heag.)Barrieta, Estela J. Mathematical Competencies of Grade One Entrants. 1975.
Lua MLA (9ú heag.)Barrieta, Estela J. Mathematical Competencies of Grade One Entrants. 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.