Who decides on the final form of the ballot text?

Cook Islands
Answer
Not specified by legislation
Source
The Constitution of the Cook Islands is at: http://www.parliament.gov.ck/Constitution.pdf
The Constitutional and Other Polls Act 1993 is at:
Comment
The Constitutional and Other Polls Act 1993 does notspecify this: in theory it might beparliament (mandatory constitutional referendum), the government (PM andCabinet in case of optional poll called by them) or some other body (since theAct allows for ad hoc regulations to govern referendums/polls).