Note- If a URL is outdated you may be able to find a copy of the article by entering the URL into the search field at http://www.archive.org/.

• Average African income and average worldwide income URL: http://www.worldbank.org/data/databytopic/GNPPC.pdf
• Ethiopean and Eritrean per capita GNP: same as above.
• Blacks earned 43% of income URL: http://www.mg.co.za/mg/za/archive/2001mar/19maram-news.htmlIf that link doesn't work you can try the "Wayback Machine" archived copy at http://web.archive.org/web/20010416233243/http://www.mg.co.za/mg/za/archive/2001mar/19maram-news.html
• SA and Namibia and Zimbabwe average income: same as first reference.
• Angola exports URL: http://www.odci.gov/cia/publications/factbook/geos/ao.html
• SA % of exports which are natural resources page 93 of this PDF http://www.imf.org/external/pubs/ft/scr/2000/cr0042.pdf
• SA total exports URL: http://www.odci.gov/cia/publications/factbook/geos/sf.html
• Nigerian oil info URL: http://www.mg.co.za/mg/za/archive/2001mar/features/17mar-nigeria.html
• Botswana diamond exports URL: http://www.odci.gov/cia/publications/factbook/geos/bc.html
• Ugandan land was not alienated URl: http://www.britannica.com/
  eb/article?eu=114657&tocid=37624
• Zairian income same as first reference.
• Tanzanian income same as first reference.
• I could not find stats on Uganda's growth rates specifically for the years 1986-2001 so I averaged the figures from sources for different years. The growth rate for 1985-1989 is from http://www.worldbank.org/data/countrydata/adi/adi2-1.pdf and the growth rate for 1991-1999 is from http://www.imf.org/external/np/exr/ib/2000/120100.html. I assumed that 1990 was the same as the previous years.