NOWLAN, R. A., & WASHBURN, R. M. (1975). Geometry for teachers. Harper and row.
Lua i Stíl Chicago (17ú heag.)NOWLAN, Robert A., agus Robert M. WASHBURN. Geometry for Teachers. New York: Harper and row, 1975.
Lua MLA (9ú heag.)NOWLAN, Robert A., agus Robert M. WASHBURN. Geometry for Teachers. Harper and row, 1975.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.