"Acórdão 255/09" (in Portuguese). Lisbon, Portugal: Tribunal Constitucional. 20 May 2009. Archived from the original on 17 July 2012. Retrieved 4 January 2014.
arquivo.pt
"Conseguimos"(PDF) (in Portuguese). Angra do Heroímso (Azores), Portugal. 2008. Archived from the original(PDF) on 2009-06-22. Retrieved 2016-09-01.
"Acórdão 255/09" (in Portuguese). Lisbon, Portugal: Tribunal Constitucional. 20 May 2009. Archived from the original on 17 July 2012. Retrieved 4 January 2014.