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

Burundi
Answer
None
Source
Burundi's Constitution of 2005
https://www.constituteproject.org/constitution/Burundi_2005.pdf
Loi No1/ 22 DU 18 SEPTEMBRE 2009 PORTANT REVISION DE LALoi No1/015 DU 20 AVRIL 2005 PORTANT CODE ELECTORAL.