WHITEHEAD GEOFFREY. (1982). PITMAN BUSINESS CORRESPONDENCE. PITMAN PUBLICATIONS.
Lua i Stíl Chicago (17ú heag.)WHITEHEAD GEOFFREY. PITMAN BUSINESS CORRESPONDENCE. LONDON: PITMAN PUBLICATIONS, 1982.
Lua MLA (9ú heag.)WHITEHEAD GEOFFREY. PITMAN BUSINESS CORRESPONDENCE. PITMAN PUBLICATIONS, 1982.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.