Issues excluded from being the subject of referendums at the national level
Turkey
Answer
None
Source
TheConstitution of the Republic of Turkey
(Adopted in7 November 1982, last amended 17 October 2001)
http://www.anayasa.gov.tr/images/loaded/pdf_dosyalari/THE_CONSTITUTION_OF_THE_REPUBLIC_OF_TURKEY.pdf
Comment
No issues are explicitly excluded from being the subject of national referendums.