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Glenda Lappan, . (2004). Comparing and Scaling: ratio, Proportion, and Percent. US: Pearson Prentice Hall.
Glenda Lappan, . 2004. Comparing and Scaling: ratio, Proportion, and Percent. US: Pearson Prentice Hall.
Glenda Lappan, . Comparing and Scaling: ratio, Proportion, and Percent. US: Pearson Prentice Hall. 2004.