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Educational psychology in a changing world

Siann, Gerda ; Ugwuegbu, Denis C.E. ; , | London : English language book society | 1984

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Statistical inference for educational researchers

Slakter, Malcolm J. ; Neill, A.S., Illustrator ; , ; Modgil, Sohan, Translator ; Siann, Gerda, Translator | London : Addison-Wesley Publising | 1972

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