Bulman 2002, стр. 171. Bulman, James C. (2002). „Henry IV, Parts 1 and 2”. Ур.: Hattaway, Michael. The Cambridge Companion to Shakespeare's History Plays. Cambridge Companions to Literature. Cambridge: Cambridge University Press. ISBN9781139000116. doi:10.1017/CCOL052177277X.010 — преко Cambridge Core.