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Dyfyniad Arddull ChicagoFreud, Sigmund. Jokes and Their Relation to the Unconscious. New York: Penguin, 1960.
Dyfyniad MLAFreud, Sigmund. Jokes and Their Relation to the Unconscious. Penguin, 1960.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.