Dyfyniad APA

(1990). Time of difficult questions. Novosti.

Dyfyniad Arddull Chicago

Time of Difficult Questions. Moscow: Novosti, 1990.

Dyfyniad MLA

Time of Difficult Questions. Novosti, 1990.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.