Dyfyniad APA

(1978). British National Bibliography(Council of the British national bibliography Ltd.London) Sub.Catalogue, eng.

Dyfyniad Arddull Chicago

British National Bibliography(Council of the British National Bibliography Ltd.London) Sub.Catalogue, Eng. 1978.

Dyfyniad MLA

British National Bibliography(Council of the British National Bibliography Ltd.London) Sub.Catalogue, Eng. 1978.

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