リチャード・スプルース
↑ Pearson, M. Richard Spruce: Naturalist and Explorer. Hudson History, Settle, Yorkshire. 2004.
↑ Wallace, A. R. (ed) and Spruce, R. Notes of a botanist on the Amazon and the Andes... during the years 1849-1864 by Richard Spruce PhD. 2 vols, cr8vo, Macmillan, London 1908. [the first part of the first volume contains all the text completed by Spruce before his death, and the rest is written by Wallace on the basis of Spruce's notes]
↑ Charbonneau, S. J. Lust For Inca Gold: The Llanganati Treasure Story & Maps. CreateSpace Independent Publishing Platform. 2012.