Lewis, R. (1982). Reading for adults. Longman Group Ltd.
Lua i Stíl Chicago (17ú heag.)Lewis, Richard. Reading for Adults. Hongkong: Longman Group Ltd, 1982.
Lua MLA (9ú heag.)Lewis, Richard. Reading for Adults. Longman Group Ltd, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.