Dyfyniad APA

LONGMAN. (1983). Financial times oil and gas international year book 1983. Longmans Inc.

Dyfyniad Arddull Chicago

LONGMAN. Financial Times Oil and Gas International Year Book 1983. Longmans Inc, 1983.

Dyfyniad MLA

LONGMAN. Financial Times Oil and Gas International Year Book 1983. Longmans Inc, 1983.

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