(1993). Basic statistics. Sage.
Lua i Stíl Chicago (17ú heag.)Basic Statistics. London: Sage, 1993.
Lua MLA (9ú heag.)Basic Statistics. Sage, 1993.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.
(1993). Basic statistics. Sage.
Lua i Stíl Chicago (17ú heag.)Basic Statistics. London: Sage, 1993.
Lua MLA (9ú heag.)Basic Statistics. Sage, 1993.