Kaučuk — разлика између измена

* -{Ascherson Neal, ''The King Incorporated'', Allen & Unwin, 1963. ISBN 1-86207-290-6 (''1999 Granta edition'').}-

* -{Hochschild, Adam, ''King Leopold’s Ghost: A Story of Greed, Terror, and Heroism in Colonial Africa'', Mariner Books, 1998. ISBN 0-330-49233-0.}-

* {{Cite book |ref= harv|titil=Rubber Technologist's Handbook |author=S.K. De, J.R. White |publisher=Smithers Rapra Press |year=1996 |id=ISBN 1-85957-262-6 |url=http://books.google.com/books?id=2rxFOm68Ui8C&pg=PA1&dq=review+rubber&hl=en&sa=X&ei=YyYET5T5LoSTiQLG_v2KDQ&ved=0CEoQ6AEwBQ#v=onepage&q=review%20rubber&f=false}}

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