The Masters and the Slaves by Gilberto Freyre
Gilberto de Mello Freyre (March 15, 1900 – July 18, 1987) was a Brazilian sociologist, cultural anthropologist, historian, journalist and congressman. His best-known work is a sociological treatise named Casa-Grande & Senzala (variously translated, but roughly The Masters and the Slaves, as on a traditional plantation).