Weinbach, R. W., & Grinnell, R. M. (1998). Statistics for social workers (4th ed.). Longman.
Lua i Stíl Chicago (17ú heag.)Weinbach, Robert W., agus Richard M. Grinnell. Statistics for Social Workers. 4th ed. New York: Longman, 1998.
Lua MLA (9ú heag.)Weinbach, Robert W., agus Richard M. Grinnell. Statistics for Social Workers. 4th ed. Longman, 1998.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.