- Cambridge University Library: DAR 106: B126-129
- British Library, The: BL Add. 46434 ff. 271-272
- Wallace Family Collection (private collection)
- Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 1. London & New York: Cassell & Co. [pp. 294-296]
No summary available.