Star Wars Sourcebook

In addition to the role-playing game, WEG also released Star Wars Sourcebook a 144-page hardcover book written by Bill Slavicsek and Curtis Smith.

[1] In the 2014 book Designers & Dragons, games historian Shannon Appelcline noted that in 1986, Bill Slavicsek began working on Star Wars: The Roleplaying Game as developer and editor, then "Early in 1987, Slavicsek was also working on another important release: The Star Wars Sourcebook (1987), which he coauthored with Curtis Smith.

This exhaustive sourcebook was one of the first references to really detail the Star Wars universe; even giving the names of some alien races for the first time.

However, he warned that the background material was far from complete, noting that "Even with the Sourcebook, though, you’ll have to improvise a lot to recreate the universe of the movies.

"[3] In the August 1988 edition of Dragon (Issue #136), Jim Bambra noted the book was "crammed with interesting background on the Star Wars universe."