Denham, C., & Lieberman, A. (1980). Time to learn. U.S. Department of education.
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Dyfyniad Arddull Chicago
Denham, Carolyn, and Ann Lieberman. Time to Learn. California: U.S. Department of education, 1980.
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Dyfyniad MLA
Denham, Carolyn, and Ann Lieberman. Time to Learn. U.S. Department of education, 1980.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.