1. Guillermo A. Baralt , ‘Slave Conspiracies and Uprisings in Puerto Rico, 1796–1848’, Ph.D. Thesis, University of Chicago, 1977;
2. Benjamín Nisral-Moret , ‘El Pueblo de Nuestra Señora de la Candelaria y del apostol San Matías de Manatí, 1800–1880: Its Ruling Classes and the Institution of Black Slavery’, Ph.D. Thesis, SUNY, Stony Brook, 1977.
3. Francisco Scarano , ‘Sugar and Slavery in Puerto Rico: The Municipality of Ponce, 1815–1849’, Ph.D. Thesis, Columbia University, 1978;
4. San Sebastian y Lares , ventas de terreno, 1885 and 1898.