Paul E.J. Hammer: Devereux, Robert, second earl of Essex (1565–1601), soldier and politician. In: Henry Colin Gray Matthew, Brian Harrison (Hrsg.): Oxford Dictionary of National Biography, from the earliest times to the year 2000 (ODNB). Oxford University Press, Oxford 2004, ISBN 0-19-861411-X; doi:10.1093/ref:odnb/7565 (Lizenz erforderlich), Stand: 4. Oktober 2008.
google.de
books.google.de
Johanna Rickman: Love, Lust, and License in Early Modern England: Illicit Sex and the Nobility. Ashgate Publishing, 2008, ISBN 978-0-7546-6135-1, S.52–57 (google.de).