Godfrey, M. (1986). Revision statistics. E. Arnold.
Lua i Stíl Chicago (17ú heag.)Godfrey, M.G. Revision Statistics. London: E. Arnold, 1986.
Lua MLA (9ú heag.)Godfrey, M.G. Revision Statistics. E. Arnold, 1986.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.