Howell, D. C. (1995). Fundamental statistics for the behavioral sciences (3rd.ed.). Duxbury.
Lua i Stíl Chicago (17ú heag.)Howell, David C. Fundamental Statistics for the Behavioral Sciences. 3rd.ed. Belmont: Duxbury, 1995.
Lua MLA (9ú heag.)Howell, David C. Fundamental Statistics for the Behavioral Sciences. 3rd.ed. Duxbury, 1995.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.