Keese, Alexander, ‘The Constraints of Late Colonial Reform Policy: Forced Labour Scandals in the Portuguese Congo (Angola) and the Limits of Reform under Authoritarian Colonial Rule, 1955–61’, in Formal and Informal Empire: Portuguese Relations with the Non-European World, ed. by Toby Green and Malyn Newitt (= Portuguese Studies, 28.2 (2012)), pp. 186–200, doi:10.5699/portstudies.28.2.0186