Cummins, J. S., and Rebelo, Luís De Sousa, ‘The Controversy over Charles Boxer's "Race Relations in the Portuguese Colonial Empire" 1415-1825’, in Homage to Charles Boxer (= Portuguese Studies, 17.1 (2001)), pp. 233–46, doi:10.2307/41105170
Cummins, J. S., and Rebelo, Luís De Sousa, ‘The Controversy over Charles Boxer's "Race Relations in the Portuguese Colonial Empire" 1415-1825’, in Homage to Charles Boxer (= Portuguese Studies, 17.1 (2001)), pp. 233–46, doi:10.2307/41105170