Não informado. (1969). Journal of Undergraduate Mathematics. Guilford College, Department of Mathematics.
Lua i Stíl Chicago (17ú heag.)Não informado. Journal of Undergraduate Mathematics. Greensboro, NC: Guilford College, Department of Mathematics, 1969.
Lua MLA (8ú heag.)Não informado. Journal of Undergraduate Mathematics. Guilford College, Department of Mathematics, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.