A History of Portugal and the Portuguese Empire: Volume One by A.R. Disney
A History of Portugal and the Portuguese Empire: Volume Two by A.R. Disney
A History of Portuguese Overseas Expansion, 1400-1668 by Malyn Newitt
Portugal: A Companion History by Jose Hermano Saraviva
Portugal: A Short History by Harold V. Livermore
The Porguese Seaborne Empire: 1415 – 1825 by Charles R. Boxer