Barrett, H. (1981). Speaking practically. Holt Rinehart & Winstor.
Lua i Stíl Chicago (17ú heag.)Barrett, Harold. Speaking Practically. New York: Holt Rinehart & Winstor, 1981.
Lua MLA (9ú heag.)Barrett, Harold. Speaking Practically. Holt Rinehart & Winstor, 1981.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.