Werts, J. E. (1954). Statistical methods in educational and psycohological research. Appleton-Century-Crofts.
Chicago-referens (17:e uppl.)Werts, James E. Statistical Methods in Educational and Psycohological Research. New York: Appleton-Century-Crofts, 1954.
MLA-referens (9:e uppl.)Werts, James E. Statistical Methods in Educational and Psycohological Research. Appleton-Century-Crofts, 1954.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.