Werts, J. E. (1954). Statistical methods in educational and psycohological research. Appleton-Century-Crofts.
Lua i Stíl Chicago (17ú heag.)Werts, James E. Statistical Methods in Educational and Psycohological Research. New York: Appleton-Century-Crofts, 1954.
Lua MLA (9ú heag.)Werts, James E. Statistical Methods in Educational and Psycohological Research. Appleton-Century-Crofts, 1954.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.