Preston, P. W. (1982). Theories of development. Routledge & Kegan Paul.
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Dyfyniad Arddull Chicago
Preston, P. W. Theories of Development. London ; Boston: Routledge & Kegan Paul, 1982.
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Dyfyniad MLA
Preston, P. W. Theories of Development. Routledge & Kegan Paul, 1982.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.