Atlasgeo: Hong Kong: Animated GIF image.
Flags of the World: Hong Kong: Current and historical flags, related laws, and houseflags.
Government Information Centre: Flags & Emblems: Specifications, standards, and usage guidelines for the national and regional flags and emblems.
Theodora.com: Flags of Hong Kong: Images in several sizes.
World Flag Database: Hong Kong: Current and past flags and country facts.