^"Clark, John Willis (CLRK851JW)". A Cambridge Alumni Database. University of Cambridge.
^"University intelligence". The Times. No. 36893. London. 8 October 1902. p. 4.
^"Review of The Life and Letters of Adam Sedgwick by J. Willis Clark and T. McKenny Hughes". The Quarterly Review. 172: 96–112. January 1891.
^"Review of The Care of Books, An Essay on the Development of Libraries and their Fittings by John Willis Clark ..." The Quarterly Review. 195: 450–465. April 1902.
Arthur Shipley, "J": a Memoir of John Willis Clark, 1913.
"Review of "J": a Memoir of John Willis Clark by A. E. Shipley". The Athenaeum (4473): 77–78. 26 July 1913.