Kaučuk — разлика између измена
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* -{''Rubber Technology'' by Maurice Morton}-
* {{Cite book |ref= harv|last=Henry|first=Hobhouse| title = Seeds of Wealth: Five Plants That Made Men Rich| publisher = Shoemaker & Hoard | date = 2003, 2005| pages=125-185|isbn=978-1-59376-089-2}}
* {{cite book|
* {{cite book|last=Hochschild|first=Adam|title=King Leopold’s Ghost: A Story of Greed, Terror, and Heroism in Colonial Africa|year=1998|url= |publisher=Mariner Books|location= |isbn=978-0-330-49233-1|pages=}}
* Petringa, Maria: ''Brazza, A Life for Africa''. Bloomington, IN: AuthorHouse. {{page|2006|978-1-4259-1198-0|pages=}}
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