Weishaar, M. E. (1993). Aaron T. Beck. Sage.
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Dyfyniad Arddull Chicago
Weishaar, Marjorie E. Aaron T. Beck. London: Sage, 1993.
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Dyfyniad MLA
Weishaar, Marjorie E. Aaron T. Beck. Sage, 1993.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.