Global Security: ES-3A Shadow
- Description of the aircraft program's brief history. Includes specifications, line drawing and photographs.
- http://globalsecurity.org/intell/systems/es-3_shadow.htm

Lockheed ES-3A Shadow
- Describes the role and mission for this aircraft type.
- http://www.rjlee.org/es3a.html

ES-3A Shadow
- Describes aircraft mission and likely areas for future upgrades.
- http://www.fas.org/man/dod-101/navy/docs/vision/shadow.htm

Federation of American Scientists: ES-3A Shadow
- Aircraft description, weights, dimensions, performance,operating units, and photos.
- http://www.fas.org/irp/program/collect/es-3_shadow.htm