Constitution of Romania (1991, as amended 2003) (excerpts related to Referendum) (English)
THE CONSTITUTION OF ROMANIA
[...]
Sovereignty
Article 2
(1) The national sovereignty shall reside within the Romanian people, that shall exercise it by means of their representative bodies, resulting from free, periodical and fair elections, as well as by referendum.
[...]
Classes of Laws
Article 73
(3) Organic laws shall regulate:
d) the organization and holding of referendum;
[...]
Referendum
Article 90
The President of Romania may, after consultation with Parliament, ask the people of Romania to express, by referendum, its will on matters of national interest.
[...]
Powers
Article 146
The Constitutional Court shall have the following powers:
i) to guard the observance of the procedure for the organization and holding of a referendum, and to confirm its returns;
[...]