Shawcross, W. (1962). Manual of commercial english. Isaac Pitman.
Lua i Stíl Chicago (17ú heag.)Shawcross, W. Manual of Commercial English. London: Isaac Pitman, 1962.
Lua MLA (9ú heag.)Shawcross, W. Manual of Commercial English. Isaac Pitman, 1962.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.