Field,John. (1980). Advanced English. Didactron.
Lua i Stíl Chicago (17ú heag.)Field,John. Advanced English. Didactron, 1980.
Lua MLA (8ú heag.)Field,John. Advanced English. Didactron, 1980.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.