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Yule, G. Udny (1939). "John Wallis, D.D., F.R.S.". Notes and Records of the Royal Society of London. 2 (1): 74–82. doi:10.1098/rsnr.1939.0012. JSTOR3087253.
loc.gov
lccn.loc.gov
Kahn, David (1967), The Codebreakers: The Story of Secret Writing, New York: Macmillan, p. 169, LCCN63016109
Dr. Wallis (1685) "Two extracts of the Journal of the Phil. Soc. of Oxford; one containing a paper, communicated March 31, 1685, by the Reverend Dr. Wallis, president of that society, concerning the strength of memory when applied with due attention; … ", Philosophical Transactions of the Royal Society of London, 15 : 1269-1271. Available on-line at:
Royal Society of London[permanent dead link]