Holden Furber, Rival Empires of Trade in the Orient, 1600-1800 (University of Minnesota Press, 1976), 26-27; Garrett Mattingly, The Armada (Houghton Mifflin Company, 1959), xvi-xvii. For the types of ships used in the Portuguese fleet, see Garrett Mattingly, The Armada (Houghton Mifflin Company, 1959), xvi-xvii.