^Matthews, L.G. (1967). The Royal apothecaries. Publications of the Wellcome Historical Medical Library. Wellcome Historical Medical Library. p. 170. Retrieved 30 April 2019.
^Matthews, L.G. (1967). The Royal apothecaries. Publications of the Wellcome Historical Medical Library. Wellcome Historical Medical Library. p. 171. Retrieved 30 April 2019.