The Enforcement of the Statutes of Labourers: During the First Decade After the Black Death 1349-1359. E-book. Formato PDF Bertha Haven Putnam   -  Forgotten Books, 2017  - 

'creighton, Hist. Of Epidemics, i, 116; for discussion of the exact date, see Gasquet, T be Great Pestilence, 71-74.