Dyfyniad APA

(1978). Basic English for Science: Cassette 4. Oxford, Oxford University Press, 1978.

Dyfyniad Arddull Chicago

Basic English for Science: Cassette 4. Oxford, Oxford University Press, 1978, 1978.

Dyfyniad MLA

Basic English for Science: Cassette 4. Oxford, Oxford University Press, 1978, 1978.

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