. Law n.º 37/81, of 3 of October, altered by Law n.º 25/94, of 19 of August, by Decree-Law n.º 322-A/2001, of 14 of December, in the version given by Decree-Law n.º 194/2003, of 23 of August, and by Institutional Laws n.º 1/2004, of 15 of January, 2/2006, of 17 of April, 1/2013, of 29 of July, 8/2015, of 22 of June, 9/2015, of 29 of July and 2/2018, of 5 of July – Portuguese Nationality Law;
. Decree-Law n.º 237-A/2006, of 14 of December, altered by Decree-Lawn.º 43/2013, of 1 of April, by Decree-Law n.º 30-A/2015, of 27 of February, and by Decree-Law n.º 71/2017, of 21 of June – Regulation of the Portuguese Nationality;
. Decree-Law n.º 322-A/2001, of 14 of December, with the subsequent alterations – Regulation of Charges and Fees of Registry and Notary Services;
. Ordinance n.º 176/2014, of 11 of September – Regulates different aspects related to how of the Portuguese language exam is carried out and revokes Ordinance n.º 1403-A/2006, of 15 of December;
. Order n.º 12941/2014, of 23 of October – Regulates in what terms the Portuguese language exam is applied.
. Decree-Law n.º 131/95, of 6 de June, with subsequent alterations – Civil Registry Code.