Harris, D. (1969). Testing english as a second language. McGraw-Hill Book.
Lua i Stíl Chicago (17ú heag.)Harris, David. Testing English as a Second Language. New York, Estados Unidos: McGraw-Hill Book, 1969.
Lua MLA (9ú heag.)Harris, David. Testing English as a Second Language. McGraw-Hill Book, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.