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Dyfyniad Arddull ChicagoJohnson, David W. Reaching Out: Interpersonal Effectiveness and ... 5th.ed. Boston: Allyn and Bacon, 1993.
Dyfyniad MLAJohnson, David W. Reaching Out: Interpersonal Effectiveness and ... 5th.ed. Allyn and Bacon, 1993.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.