David Lewis Tengwell, The Portuguese Revolution (1640-1668). A European War of Freedom and Independence v9n2a05
https://digigov.cepese.pt/portal/pt/publicacoes/obras/volume-9-number-2-winter-2011/artigos/david-lewis-tengwell-the-portuguese-revolution-1640-1668-a-european-war-of-freedom-and-independence-v9n2a05/view
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David Lewis Tengwell, The Portuguese Revolution (1640-1668). A European War of Freedom and Independence v9n2a05
David Lewis Tengwell, The Portuguese Revolution (1640-1668). A European War of Freedom and Independence v9n2a05.pdf