Burton, S. H. (1976). Using english: A language course for advanced students (1a. ed.). Longman Group.
Lua i Stíl Chicago (17ú heag.)Burton, S. H. Using English: A Language Course for Advanced Students. 1a. ed. Londres: Longman Group, 1976.
Lua MLA (9ú heag.)Burton, S. H. Using English: A Language Course for Advanced Students. 1a. ed. Longman Group, 1976.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.