-This collection ... is a veritable treasure trove for any reader or writer who has ever wanted to expand their knowledge of Science Fiction and Fantasy in various mediums... Gary Westfahl ... has done a fantastic job of compiling three reading companions on topics far and wide, contributed by some of the best known and relevant writers of our time in the genre... Whether your taste is toward academic discussions or entertainment, the three volumes will entertain and illuminate your way through a genre that has never lost its appeal since it was officially given a shelf of its own. And no matter how well versed you are on the topic, you're sure to learn something new between the collective 2600 pages... I highly recommend The Greenwood Encyclopedia of Science Fiction and Fantasy: Themes, Works, and Wonders. You'd be hard pressed to find anything similar in book form that covers this much ground, and in such fine fashion. The foreword by Neil Gaiman is simply the cherry on the cake. —Simulacrum

-[T]his will be a useful inclusion in a library reference section.... Westfahl has done an admirable job... —English

-[T]he first reference work that gathers everything you need right at your side with an overview, all in one place. More reliable than Wikipedia with just enough detail to give you the knowledge you need....Any library with a more than bare bones speculative fiction collection needs this...[a]s does anyone who is more than simply a fan of this literature....Westfahl should be quite proud of this work! —Green Man Reviews