Theresa LewisLives of the Friends and Contemporaries of Lord Chancellor Clarendon: Illustrative of Portraits in His Gallery, Volume 3 (J. Murray, 1852), p. 316
Firth & Leslie 1925, p. 190. Firth, Charles Harding; Leslie, JH (1925). "The Siege and capture of Bristol by Royalist forces in 1643". Journal of the Society for Army Historical Research. 4 (18): 180–203. JSTOR44227516.