Lewis, D. G. (1968). Experimental design in educaton. Uni. pr..
Tohutoru Kātū Chicago (17th ed.)Lewis, D. G. Experimental Design in Educaton. London: Uni. pr., 1968.
Tohutoro MLA (9th ed.)Lewis, D. G. Experimental Design in Educaton. Uni. pr., 1968.
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