Wainwright, G. (1999). Tricky business letters. Universities Press.
Lua i Stíl Chicago (17ú heag.)Wainwright, Gordon. Tricky Business Letters. Hyderabad: Universities Press, 1999.
Lua MLA (9ú heag.)Wainwright, Gordon. Tricky Business Letters. Universities Press, 1999.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.