Fisher, D. (1968). Commercial english: Comprehension passages. Longmans Green.
Lua i Stíl Chicago (17ú heag.)Fisher, David. Commercial English: Comprehension Passages. London: Longmans Green, 1968.
Lua MLA (9ú heag.)Fisher, David. Commercial English: Comprehension Passages. Longmans Green, 1968.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.