Roberts, P. (1962). English sentences. Harcourt.
Lua i Stíl Chicago (17ú heag.)Roberts, Paul. English Sentences. New York: Harcourt, 1962.
Lua MLA (9ú heag.)Roberts, Paul. English Sentences. Harcourt, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.