Watzlawick, P., Weakland, J. H., & Fisch, R. (1974). Change: Principles of problem formation and problem resolution. Norton.
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Dyfyniad Arddull Chicago
Watzlawick, Paul, John H. Weakland, and Richard Fisch. Change: Principles of Problem Formation and Problem Resolution. New York: Norton, 1974.
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Dyfyniad MLA
Watzlawick, Paul, et al. Change: Principles of Problem Formation and Problem Resolution. Norton, 1974.
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Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.