Werts, J. E. (1954). Statistical methods in educational and psycohological research. Appleton-Century-Crofts.
Citace podle Chicago (17th ed.)Werts, James E. Statistical Methods in Educational and Psycohological Research. New York: Appleton-Century-Crofts, 1954.
Citace podle MLA (9th ed.)Werts, James E. Statistical Methods in Educational and Psycohological Research. Appleton-Century-Crofts, 1954.
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