Book John Hemming (2015)
Naturalists in Paradise: Wallace, Bates and Spruce in the Amazon. (/isis/citation/CBB595809530/) unapi

Book Gribbin, Mary; Gribbin, John R. (2008)
Flower Hunters. (/isis/citation/CBB000774290/) unapi

Book Pearson, Michael B. (2004)
Richard Spruce: Naturalist and Explorer. (/isis/citation/CBB000772521/) unapi

Article Pearson, M.B. (1998)
Archival sources of Richard Spruce: A further listing. Archives of Natural History (p. 133). (/isis/citation/CBB000076319/) unapi

Book Seaward, M.R.D.; FitzGerald, S.M.D. (1996)
Richard Spruce (1817-1893): Botanist and explorer. (/isis/citation/CBB000071888/) unapi

Article Seward, Mark (1995)
Spruce's diary. The Linnean: Newsletter and Proceedings of the Linnean Society of London (pp. 17-19). (/isis/citation/CBB000064233/) unapi

Article Schultes, R. E. (1978)
Richard Spruce and the potential for European settlement of the Amazon: An unpublished letter. Botanical Journal of the Linnean Society (pp. 131-139). (/isis/citation/CBB000001429/) unapi

Article Schultes, Richard Evans (1978)
An unpublished letter by Richard Spruce on the theory of evolution. Biological Journal of the Linnean Society (pp. 159-161). (/isis/citation/CBB000015893/) unapi