References
- Michael Edward Stanfield, Red Rubber, Bleeding Trees: Violence, Slavery, and Empire in Northwest Amazonia, 1850-1933
- Paula Mageste. "Exército da borracha". Época (in pt). Retrieved 2007-08-21.
- "Batalha da borracha". Istoé (in pt). December 30, 1998. Retrieved 2007-08-21.
- Sir Roger Casement; Walter Ernest Hardenburg (1913). In Charles Reginald Enock. The Putumayo: the devil's paradise; travels in the Peruvian Amazon region and an account of the atrocities committed upon the Indians therein. T. F. Unwin. p. 347.
- Sir Roger Casement; Angus Mitchell (1997). The Amazon journal of Roger Casement. Angus Mitchell. p. 534. ISBN 1-901990-00-1.
- Aitchison, Mark. "The Tree that Weeps: A History of Amazon Rubber." Brazilmax.com, n.d. Web. 1 Jun 2011.
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