Martin Hume: The Courtships of Queen Elizabeth, Eveleigh Nash & Grayson, London 1904 [1], S. 90–104.
P.E.J. Hammer: The Polarisation of Elizabethan Politics: The Political Career of Robert Devereux, 2nd Earl of Essex 1585–1597, Cambridge UP 1999, ISBN 0-521-01941-9, S. 43; H.M.S. Hume (Hrsg.): Calendar of … State Papers Relating to English Affairs … in … Simancas 1558–1603, 4 Bde., London 1892–1899, Bd. III, S. 477.
