1. Ames, P. 2017. “EU Defense Pact Tests Portugal‘s left-wing Government Alliance”. Politico, November 11. https://www.politico.eu/article/eu-defense-pact-tests-portugals-left-wing-government-alliance/
2. de Sousa, T. 2016. “Um acordo bilateral para os imigrantes portugueses ‘é perfeitamente alcançável‘, diz Santos Silva.” Público, June 18. https://www.publico.pt/2016/06/18/mundo/noticia/um-acordo-bilateral-para-os-imigrantes-portugueses-e-perfeitamente-alcancavel-diz-santos-silva-1735520
3. Between Scylla and Charybdis: Assessing Portugal’s Approach to the Common Foreign and Security Policy