Defender - Videogame by Williams Electronics, Inc. (1967-1985) | Museum of the Game
Defender: an all-time classic that still offers lessons today - Polygon
Game review: Atarisoft's Defender for #Colecovision | visually stunning & plays great
The History of Defender: The Joys of Difficult Games
GitHub - philspil66/Defender: Defender is a scrolling shooter video arcade game developed by Williams Electronics in 1980. This is the original source code for the Red Label version.
File:Arcade Defender, Made by Entex Industries, Inc., Made in Taiwan, Copyright 1981 (LED Handheld Electronic Game) (2).jpg - Wikimedia Commons
Defender (Video Game 1981) - IMDb
Defender / Defender II Arcade Video Multi Game Machine - AceAmusements.us
9 Things You Might Not Know About Defender | Mental Floss
Indie Retro News: Defender - A downloadable Remaster of a 1980's arcade classic for Windows
Defender (Arcade, 1981) - Video Game Years History - YouTube