Paxton, J. e. (1989). Teh statesman`s year book 1989-1990. Macmillan.
Lua i Stíl Chicago (17ú heag.)Paxton, John ed. Teh Statesman`s Year Book 1989-1990. London: Macmillan, 1989.
Lua MLA (9ú heag.)Paxton, John ed. Teh Statesman`s Year Book 1989-1990. Macmillan, 1989.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.