More links and websites
What is a referendum?
This section of the Elections New Zealand website provides information on referendums that have been held in New Zealand.
More suggestions and sources
Atkinson, Neill. Adventures in democracy: a history of the vote in New Zealand. Dunedin: University of Otago Press, 2003.
Christoffel, Paul. ‘Prohibition and the Myth of 1919.’ New Zealand Journal of History 42, no. 2 (2008): 154–175.
Church, Stephen. ‘Crime and punishment: the referenda to reform the criminal justice system and reduce the size of Parliament.’ In Left turn: the New Zealand general election of 1999, edited by Jonathan Boston and others, pp. 184–198. Wellington: Victoria University Press, 2000.