Levin, J. (2003). Elementary statistics in social research. Pearson Education.
Lua i Stíl Chicago (17ú heag.)Levin, Jack. Elementary Statistics in Social Research. Pearson Education, 2003.
Lua MLA (8ú heag.)Levin, Jack. Elementary Statistics in Social Research. Pearson Education, 2003.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.