Christensen,Howard B. (1977). Statistics step by step. Houghton Mifflin.
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Tohutoru Kātū Chicago (17th ed.)
Christensen,Howard B. Statistics Step by Step. Atlanta: Houghton Mifflin, 1977.
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Tohutoro MLA (9th ed.)
Christensen,Howard B. Statistics Step by Step. Houghton Mifflin, 1977.
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