Dyfyniad APA

Professional. (2019). Copyright Act 1957. Professional Book.

Dyfyniad Arddull Chicago

Professional. Copyright Act 1957. Delhi: Professional Book, 2019.

Dyfyniad MLA

Professional. Copyright Act 1957. Professional Book, 2019.

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