International, W. B. C. (1978). Science Year: The world book science annual. U.S.A.
Chicago Edition CitationInternational, World Book Childcraft. Science Year: The World Book Science Annual. Chicago: U.S.A, 1978.
Deismireacht MLAInternational, World Book Childcraft. Science Year: The World Book Science Annual. U.S.A, 1978.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.