Poland

https://www.hellenicaworld.com/Poland/Poland.html

governmental acts; constitutional law rulings of the Constitutional Tribunal are final Constitution history: several previous; latest adopted 2 April 1997, approved by referendum
World Library, Michael Lahanas

Mongolia

https://www.hellenicaworld.com/Mongolia/en/Mongolia.html

Great Hural by the Constitutional Court; conducting referenda on proposed amendments requires at least two-thirds majority vote of the State Great Hural; passage of amendments by
Mongolia, World Library

That's everything I could find.
Help make me smarter by submitting a page.