Taylor, C. S. (2013). Validity and validation. Oxford University Press.
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Dyfyniad Arddull Chicago
Taylor, Catherine S. Validity and Validation. Oxford: Oxford University Press, 2013.
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Dyfyniad MLA
Taylor, Catherine S. Validity and Validation. Oxford University Press, 2013.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.