The Douglas system was first mentioned in "Twinkle, Twinkle Little Star, How I Wonder Where We Are," a 1990 roleplaying game source article published in the thirteenth issue of the Voyages SF magazine, based on the mention of Douglas III in Lando Calrissian and the Mindharp of Sharu, the 1983 first entry in the The Lando Calrissian Adventures trilogy of novels written by L. Neil Smith. "Twinkle, Twinkle Little Star, How I Wonder Where We Are" placed the system in the Jospro sector. Since that article was released outside of the Lucas Licensing process, its canonicity within the Star Wars Legends continuity was never confirmed.
In 1998, Douglas III, and therefore the Douglas system, made its first appearance in the video game Star Wars: Rebellion, which also placed it in the Jospro sector. The Wizards of the Coast roleplaying game source article "A Campaign Guide to the Centrality"—authored by Michael Kogge and published in the fifth issue of the Star Wars Gamer magazine on July 24, 2001—marked the first time the name of the Douglas system was featured in an undeniably licensed Star Wars source. The article also established that the Douglas system was a part of the Centrality, a placement that was confirmed by the 2009 reference book The Essential Atlas, which pin-pointed the system's location to grid square U-8.
The Douglas system was first mentioned in "Twinkle, Twinkle Little Star, How I Wonder Where We Are," a 1990 roleplaying game source article published in the thirteenth issue of the Voyages SF magazine, based on the mention of Douglas III in Lando Calrissian and the Mindharp of Sharu, the 1983 first entry in the The Lando Calrissian Adventures trilogy of novels written by L. Neil Smith. "Twinkle, Twinkle Little Star, How I Wonder Where We Are" placed the system in the Jospro sector. Since that article was released outside of the Lucas Licensing process, its canonicity within the Star Wars Legends continuity was never confirmed.
In 1998, Douglas III, and therefore the Douglas system, made its first appearance in the video game Star Wars: Rebellion, which also placed it in the Jospro sector. The Wizards of the Coast roleplaying game source article "A Campaign Guide to the Centrality"—authored by Michael Kogge and published in the fifth issue of the Star Wars Gamer magazine on July 24, 2001—marked the first time the name of the Douglas system was featured in an undeniably licensed Star Wars source. The article also established that the Douglas system was a part of the Centrality, a placement that was confirmed by the 2009 reference book The Essential Atlas, which pin-pointed the system's location to grid square U-8.
- "Twinkle, Twinkle Little Star, How I Wonder Where We Are" — Voyages SF 13
- "A Campaign Guide to the Centrality" — Star Wars Gamer 5
- The Essential Atlas