Вештачка гума — разлика између измена

Cite book
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* {{Cite book |ref= harv|last=Slack|first=Charles|title=Noble Obsession: Charles Goodyear, Thomas Hancock, and the Race to Unlock the Greatest Industrial Secret of the 19th Century|url=http://books.google.com/books?id=XuUjgUaZzOAC|year=2003|publisher=Hyperion Books|isbn=978-0-7868-8856-6}}
* {{cite book|author=Neal Ascherson, ''|title=The King Incorporated'',|year=1963|url= |publisher=Allen & Unwin. {{page|1963location= |isbn=978-1-86207-290-9|pages=}} (''1999 Granta edition'').
* {{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=}}