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Dyfyniad Arddull ChicagoRees Shan. Assertion Training: How to Be Who You Really Are. London: Tavistock Routeledge, 1991.
Dyfyniad MLARees Shan. Assertion Training: How to Be Who You Really Are. Tavistock Routeledge, 1991.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.