Atlasgeo.net: Estonia - Animated GIF image.
Estonia Country Guide: State Flag - Sepcifications, symbolism, and official days of use.
Estonian National Symbols - History of the state flag and coat of arms.
Flags of the World: Estonia - National, governmental, municipality, and historical flags.
National Symbols of Estonia - History of the flag, its colors, the coat of arms, and the national anthem.
Theodora.com: Estonia's Flags - Images in several sizes.
World Flag Database: Estonia - National flag, naval ensign, and country details.