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Helmstadter G., . (1964). Principles of Psychological Measurement. : Appleton-Century Crofts.
Helmstadter G.C, . 1964. Principles of Psychological Measurement. : Appleton-Century Crofts.
Helmstadter G.C, . Principles of Psychological Measurement. : Appleton-Century Crofts. 1964.
