Legal provisions for mandatory referendums at national level

Rwanda
Constitutionof the Republic of Rwanda
(Adoptedin June 2003, last amended in December 2003)
http://www.rwandahope.com/constitution.pdf
Article189.3 (Mandatory)
Itis not permitted to cede or exchange part of the territory of Rwanda or to jointo Rwanda part of another country without the consent of the people byreferendum.
Article193.3 (Mandatory)
However,if the constitutional amendment concerns the term of the President of theRepublic or the system of democratic government based on political pluralism,or the constitutional regime established by this Constitution especially therepublican form of the government or national sovereignty, the amendment mustbe passed by referendum, after adoption by each Chamber of Parliament.