Dyfyniad APA

(1990). The Soviet Union: A systematic geography. London: Hodder and Houghton.

Dyfyniad Arddull Chicago

The Soviet Union: A Systematic Geography. London: Hodder and Houghton, 1990.

Dyfyniad MLA

The Soviet Union: A Systematic Geography. London: Hodder and Houghton, 1990.

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