Reference works
This is the index and introduction for Trek reference sources.

Books/Blueprints
The following books and blueprint sets were officially licensed for publication by Paramount Pictures or CBS Consumer Products, aka "The Franchise":

Companions
A "Companion", also on occasion referred to as "Compendium" or, more to the point, "(Episode) Guide" concern reference works that collects information on productions that are produced/released sequentially as part of a series. The defining characteristic of such a work is that its contents is organized on a per episode/outing basis – either by their production, or by their release chronology in the series. Companions can consist of a simple (non-in-universe POV) recapitulation of each individual series' outing (either television, film, or both, where motion picture productions are concerned), as indeed most such works started out as, typically as fan productions, be it licensed or unlicensed.

However, from early on it has become commonplace to greatly enhance such works with elaborate production POV background information, while still organized around, and adhering to, the established chronology. Bjo Trimble's Star Trek Concordance unlicensed fan production was actually the very first such work thus enhanced where the Star Trek franchise was concerned (becoming officially licensed after-the-fact, incidentally), and served as the template for Allan Asherman's later officially licensed The Star Trek Compendium, which set the stage for ever more enhanced such works (mostly officially licensed) to have followed suit since, with Marc Cushman's three (unlicensed) These Are the Voyages: TOS volumes as the high water mark for the time being.

While it is most obvious that the vast majority of the published companions only concern themselves with the motion picture productions, there actually is one notable exception; the 2006  book does not deal with the live-action franchise, but rather with the Star Trek novels print franchise.

1 While strictly speaking a magazine, the fact that the British edition was endowed with an ISBN warrants its inclusion on this list.

The "Companion" format was not restricted to books only, as the genre magazine Cinefantastique, became renowned for its Star Trek series-themed issues in the 1990s, which featured series episode guides with heavy background information coverage on the season in question. The magazine actually outperformed the official franchise publications in the production background information department by far during that decade.

Scripts
Several script collections have been published, some by Pocket Books, and some by Roddenberry Productions.

Other works
The following books contain critical reviews of Star Trek, acadamic treatises on Star Trek, and compilations of references from Star Trek, but were published by parties other than Paramount Pictures and its licensees; in other words, they are "unofficial publications":

International work
The following books are reference works that do not have English-language counterparts, and are therefore foreign-language originals. These concern both officially franchise licensed as well as unofficial publications:

CD-ROMs
Star Trek Omnipedia
Star Trek: Captain's Chair
Star Trek: The Next Generation Companion - A Series Guide and Script Library
Star Trek: The Next Generation Episode Guide
Star Trek: The Next Generation Interactive Technical Manual
Star Trek: Deep Space Nine Companion - A Series Guide and Script Library

Biographies/Autobiographies
Most (auto-)biographies are unofficial publications, as they allow their author(s) to freely voice more critical opinions if they feel that such is warranted. The only five known officially licensed (auto)biographies are the To the Stars (1994), Beam Me Up, Scotty (1996), and From Sawdust to Stardust (2005) biographies, as well as Walter Koenig's earlier 1980 Chekov's Enterprise autobiography, dealing with his personal experiences on , and Lisabeth Shatner's 1989 Captain's Log: William Shatner's Personal Account of the Making of Star Trek V: The Final Frontier biography dealing with her father's experiences on  as both an actor as well as a director. In contrast, William Shatner's own, and – as per his well-known character trait – more outspoken, autobiographies are all without exception unofficial, precisely because they are all more critical of the franchise.

Yvonne Fern's 1994 Gene Roddenberry: The Last Conversation biography constituted an oddity, because it became officially licensed after-the-fact in 1996.

See also 
 Undeveloped Star Trek publications

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