Vervoort, G., & Mason, D. J. (1980). Beginning calculator math. D.S. Lake.
Lua i Stíl Chicago (17ú heag.)Vervoort, Gerardus, agus Dale J. Mason. Beginning Calculator Math. Belmont, Calif: D.S. Lake, 1980.
Lua MLA (9ú heag.)Vervoort, Gerardus, agus Dale J. Mason. Beginning Calculator Math. D.S. Lake, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.