Quorum requirements for a referendum to be valid

Armenia
Answer
- Mandatory referendum - approval quorum
- Optional referendum - approval quorum
Source
Armenia, Constitution 2015, accessed 5 September 2022
Article 207. Adoption of an Act Put to Referendum
An act put to referendum shall be adopted in case more than half of the participants of the referendum, but not less than one fourth of citizens with the right to participate in referenda, have voted in favour.