Fisher, D. (1963). Graded comprehension for advanced students. Longman.
Lua i Stíl Chicago (17ú heag.)Fisher, David. Graded Comprehension for Advanced Students. London: Longman, 1963.
Lua MLA (9ú heag.)Fisher, David. Graded Comprehension for Advanced Students. Longman, 1963.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.