Wallerstein, I. 2000. The Essential Wallerstein. New York, NY: The New Press. For a slightly adapted version of the Introductory essay to The Essential Wallerstein, see: http://iwallerstein.com/intellectual-itinerary/
Wallerstein, Immanuel Maurice (1959). The Emergence of Two West African Nations: Ghana and the Ivory Coast (Dissertation). ProQuest LLC. ProQuest301893682.