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Dyfyniad Arddull ChicagoZon, Hans van. Crisis in the Socialist International Economy: The Case of Hungary and the GDR, 1968-1989. Netherlands: Universiteit van Amsterdam, 1994.
Dyfyniad MLAZon, Hans van. Crisis in the Socialist International Economy: The Case of Hungary and the GDR, 1968-1989. Universiteit van Amsterdam, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.