- Linnean Society of London: MS 140a-31
- British Library, The: BL Add. 46438 ff. 193-194
- Natural History Museum, London: NHM WP1/8/286
- Marchant, J. (Ed.). (1916). In: Alfred Russel Wallace; Letters and Reminiscences. Vol. 2. London & New York: Cassell & Co. [pp. 93-95]
No summary available.