RAY, C. M. (1983). Supervision. Dryden Press.
Lua i Stíl Chicago (17ú heag.)RAY, Charles M. Supervision. Dryden Press, 1983.
Lua MLA (9ú heag.)RAY, Charles M. Supervision. Dryden Press, 1983.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.