School Mathematics Project. (1969). SMP Book D. The University Press.
Lua i Stíl Chicago (17ú heag.)School Mathematics Project. SMP Book D. Cambridge: The University Press, 1969.
Lua MLA (9ú heag.)School Mathematics Project. SMP Book D. The University Press, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.