- Natural History Museum, London: NHM WP1/1/183
- Wallace, W. G. & Wallace, V. (1916). Part IV. Home Life. 103-138. In: Marchant, J. (Ed.). Alfred Russel Wallace; Letters and Reminiscences. Vol. 2. London & New York: Cassell & Co. [pp. 121-122]
William Greenell Wallace's proof corrections [to Man's Place in the Universe], stars, Milky Way, Solar Cluster, Jupiter; speculation in accordance with known facts; difference of opinion over spiritualism; writing an article for the Fortnightly; purchase of a telescope from Cooke of York, better than the last, making a stand for it; trying to help Fred Birch to get a post as Museum curator in the Federated Malay States.