Harris, D. P. (1969). Testing English as a second language. McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)Harris, David P. Testing English as a Second Language. New York: McGraw-Hill, 1969.
Lua MLA (8ú heag.)Harris, David P. Testing English as a Second Language. McGraw-Hill, 1969.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.