(1999). World of Learning 2000 (50th ed.). Europa Publications.
Chicago Edition CitationWorld of Learning 2000. 50th ed. London: Europa Publications, 1999.
Deismireacht MLAWorld of Learning 2000. 50th ed. Europa Publications, 1999.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.