Lay, P. History today. [London: s.n.].
Trích dẫn kiểu ChicagoLay, Paul. History Today. [London: s.n.].
Deismireacht MLALay, Paul. History Today. [London: s.n.].
Rabhadh: D'fhéadfadh nach mbeadh na deismireachtaí seo 100% cruinn i gcónaí.
Lay, P. History today. [London: s.n.].
Trích dẫn kiểu ChicagoLay, Paul. History Today. [London: s.n.].
Deismireacht MLALay, Paul. History Today. [London: s.n.].