"A lamentable Dittie composed upon the death of
Robert Lord Devereux late Earle of Essex, who was beheaded in the Tower of London, upon Ash Wednesday in the morning. 1601.", 1603, http://ebba.english.ucsb.edu/ballad/32221/image
Vincentio Saviolo, his practise, in two bookes, the first intreating of the use of the Rapier and Dagger, the second of Honor and honorable quarrels. London, printed by John Wolfe, 1595, http://www.cs.unc.edu/~hudson/saviolo/
Hammer 1999, p. 13 Hammer, Paul E. J. (1999). The polarisation of Elizabethan politics : the political career of Robert Devereux, 2nd Earl of Essex, 1585–1597. Cambridge: Cambridge University Press. ISBN0-521-43485-8. OCLC39539158.
Hammer 1999, p. 32 Hammer, Paul E. J. (1999). The polarisation of Elizabethan politics : the political career of Robert Devereux, 2nd Earl of Essex, 1585–1597. Cambridge: Cambridge University Press. ISBN0-521-43485-8. OCLC39539158.
Hammer 1999, p. 69 Hammer, Paul E. J. (1999). The polarisation of Elizabethan politics : the political career of Robert Devereux, 2nd Earl of Essex, 1585–1597. Cambridge: Cambridge University Press. ISBN0-521-43485-8. OCLC39539158.
Hammer 1999, pp. 60–61 Hammer, Paul E. J. (1999). The polarisation of Elizabethan politics : the political career of Robert Devereux, 2nd Earl of Essex, 1585–1597. Cambridge: Cambridge University Press. ISBN0-521-43485-8. OCLC39539158.
