"Statistical area 1 dataset for 2018 Census". Statistics New Zealand. March 2020. Springlands (307500), Yelverton (307600), Mayfield (307700), Whitney West (307800), Blenheim Central (307900), Riversdale-Islington (308000), Whitney East (308100), Redwoodtown West (308200), Witherlea West (308300), Redwoodtown East (308400) and Witherlea East (308600).
McLintock, Alexander Hare; Brian Newton Davis, M. A.; Taonga, New Zealand Ministry for Culture and Heritage Te Manatu. "BLENHEIM". An encyclopaedia of New Zealand, edited by A. H. McLintock, 1966.[permanent dead link]