Dyfyniad APA

Gertenfeld, M. (1961). West Europe's petrochemical industry in the seventies. France: Sóciété Générale.

Dyfyniad Arddull Chicago

Gertenfeld, M. West Europe's Petrochemical Industry in the Seventies. France: Sóciété Générale, 1961.

Dyfyniad MLA

Gertenfeld, M. West Europe's Petrochemical Industry in the Seventies. France: Sóciété Générale, 1961.

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