(1991). The world of learning 1992. London: Europa Publications Limited.
Trích dẫn kiểu ChicagoThe World of Learning 1992. London: Europa Publications Limited, 1991.
Deismireacht MLAThe World of Learning 1992. London: Europa Publications Limited, 1991.
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.