Ballara, Angela. Iwi: the dynamics of Māori tribal organisation from c. 1769 to c. 1945. Wellington: Victoria University Press, 1998.

Cox, Lindsay. Kotahitanga: the search for Maori political unity. Auckland: Oxford University Press, 1993.

Jones, Pei Te Hurinui. ‘Maori kings.’ In The Maori people in the nineteen-sixties: a symposium, edited by Erik Schwimmer, 132–173. Auckland: Longman Paul, 1968.

Mahuika, A. ‘Leadership: inherited and achieved.’ In Te Ao hurihuri: aspects of Maoritanga, edited by Michael King, 47–56. Auckland: Hicks Smith, 1975.

Pool, Ian. Te iwi Maori: a New Zealand population, past, present and projected. Auckland: Auckland University Press, 1991.

Walker, Ranginui. Ka whawhai tonu mātou: struggle without end. Auckland: Penguin, 1990.