Haurongo: Holland, Henry Edmund
He whakaaturanga anō
Rārangi pukapuka
Franks, P. & J. McAloon. Labour: the New Zealand Labour Party, 1916–2016. Wellington, 2016
Gustafson, B. Labour's path to political independence. Auckland, 1980
O'Farrell, P. J. Harry Holland, militant socialist. Canberra, 1964