Sharp, D. L. L. (1957). Why teach? Holt.
Lua i Stíl Chicago (17ú heag.)Sharp, Delia Louise Larson. Why Teach? New York: Holt, 1957.
Lua MLA (9ú heag.)Sharp, Delia Louise Larson. Why Teach? Holt, 1957.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.