(1990). Time of difficult questions. Novosti.
Dyfyniad Arddull ChicagoTime of Difficult Questions. Moscow: Novosti, 1990.
Dyfyniad MLATime of Difficult Questions. Novosti, 1990.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.
(1990). Time of difficult questions. Novosti.
Dyfyniad Arddull ChicagoTime of Difficult Questions. Moscow: Novosti, 1990.
Dyfyniad MLATime of Difficult Questions. Novosti, 1990.