Tabiiy kauchuk Natural rubber

Ascherson, Nil (1999). The King Incorporated: Leopold the Second and the Congo. Granta Books. ISBN 978-1-86207-290-9. (1999 Granta edition).

Brydson, J.A. (30 November 1988). Rubbery Materials and their Compounds. Springer Niderlandiya. ISBN 978-1-85166-215-9.

Hobhouse, Henry (2005) [2003]. Seeds of Wealth: Five Plants That Made Men Rich. Shoemaker & Hoard. pp. 125–185. ISBN 978-1-59376-089-2.

Xoxsild, Odam (2002). King Leopold's Ghost: A Story of Greed, Terror, and Heroism in Colonial Africa. Pan. ISBN 978-0-330-49233-1.

Morton, M. (2013). Rubber Technology. Springer Science & Business Media. ISBN 978-94-017-2925-3.

Petringa, Maria (2006). Brazzà, A Life for Africa. Muallif uyi. ISBN 978-1-4520-7605-8.