Dyfyniad APA

Arthur C. Clarke (Great Neck Publishing). Great Neck Publishing.

Dyfyniad Arddull Chicago

Arthur C. Clarke (Great Neck Publishing). Great Neck Publishing.

Dyfyniad MLA

Arthur C. Clarke (Great Neck Publishing). Great Neck Publishing.

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