W. E. B. Du Bois (2014). “Black Folk Then and Now (The Oxford W.E.B. Du Bois): An Essay in the History and Sociology of the Negro Race”, p.103, Oxford University Press
"Alex Gibney on Steve Jobs: 'He was ruthless when it came to a beveled edge for the iPhone - but paying workers more in China? No way'". Interview with Andrew O'Hehir, www.salon.com. September 4, 2015.