Rhoad, R., Milauskas, G., & Whipple, R. (1991). Geometry for enjoyment and challenge (New ed.). McDougal, Littell.
Lua i Stíl Chicago (17ú heag.)Rhoad, Richard, George Milauskas, agus Robert Whipple. Geometry for Enjoyment and Challenge. New ed. Evanston, Ill: McDougal, Littell, 1991.
Lua MLA (9ú heag.)Rhoad, Richard, et al. Geometry for Enjoyment and Challenge. New ed. McDougal, Littell, 1991.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.