Atlasgeo: New Zealand: Animated GIF image.
Flags of the World: New Zealand: National, subnational, royal, military, historical, and Maori flags.
Ministry for Culture and Heritage: New Zealand Flag: History, description, usage guidelines, flag days, and FAQ.
Theodora.com: New Zealand Flags: Images in several sizes.
World Flag Database: New Zealand: National and royal flags and ensigns, as well as country facts.