Issues in relation to which referendums are optional at the national level

Cyprus (North)
Constitution 1983
Article 88 (4). The President of the Republic may, if he considers it necessary, have recourse to a referendum before deciding to hold new elections for the Assembly of the Republic under paragraphs (2) and (3) of this Article.
Article 94 (3). The President of the Republic shall, at the request of the Council of Ministers, refer any law enacted by the Assembly of the Republic to a referendum within the period prescribed for promulgation. The laws approved by referendum shall be promulgated by publication in the Official Gazette within ten days of their approval.