From DePauw University's Science Fiction Studies Journal.

First published in print in 1979, the fourth edition, published in 2021, is completely online. All entries are "written by noted experts in the field of science fiction, some of them being very well known."

"A community effort to catalog works of science fiction, fantasy, and horror. It links together various types of bibliographic data: author bibliographies, publication bibliographies, award listings, magazine content listings, anthology and collection content listings, and forthcoming books."

Collection of materials related to and written by Hugo Gernsback, founding publisher of Amazing Stories, the first science fiction magazine.

"A fan-run web site and growing online community, dedicated to identifying, reading and sharing the best Speculative Fiction books the genre has to offer." Provides information about books, authors, and awards, as well as lists of best books in SF and its sub-genres.