Report on the Conditions of Coloured Labour on the Cocoa Plantations of S. Tomé and Principe
"The Anti-Slavery Reporter and Aborigines's Friend". Ed. Anti-Slavery & Aborigines Protection Society. Series V, Vol. I, N.º 5 (October, 1910).
Os serviçais de S. Tomé de William A. Cadbury
"The Anti-Slavery Reporter and Aborigines's Friend". Ed. Anti-Slavery & Aborigines Protection Society. Series V, Vol. I, N.º 6 (January, 1911).
Relatório sobre as Condições dos Serviçais empregados nas Plantações de Cacau de S. Tomé
Slave Labour on Cocoa Plantations
"The Anti-Slavery Reporter and Aborigines's Friend". Ed. Anti-Slavery & Aborigines Protection Society. Series V, Vol. 3, N.º 1 (April, 1913).
Slavery in West Africa. Portuguese Revelations
Portuguese Slavery
Relatórios anuais
Espólio Alfredo Henrique da Silva
