- Cambridge University Library: DAR 106: B25, B26
- British Library, The: BL Add. 46434 f. 55
- Wallace Family Collection (private collection)
- Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 1. London & New York: Cassell & Co. [pp. 162-163]
No summary available.