Cape Verde Islands. Handbooks prepared under the direction of the Historical Section of the Foreign Office. No. 117. Published by H.M. Stationery Ofice. London, 1920 [1]
books.google.com
Diffie W.D. and Winius G.D. Foundations of the Portuguese Empire 1415-1580. The University of Minnesota, 1977. Page 111 [2]
