Written literature is usually a solo endeavour. Which is another way to say, "books usually only have a single author".
The requirement of the truth, to speak of probabilities, creates a new category. Books with more than one author.
This is the index for works in that category.
Works by House Pseudonyms are a subset of this, as it groups multiple authors of a work, therefore making its works automatically coauthored, so listing them here is redundant and unneeded. But since it's not specific to literature, its examples also go here.
Similarly, Outlived Its Creator works must be co-authored, because the work must outlive its original creator by having a second one. But since that trope is not specific to literature, its examples also go here.
- David Eddings' wife Leigh co-authored all his books, but went uncredited until the mid 90s as his publisher was against multi-author credits.
- David Weber has several series of these:
- Ilona Andrews are a wife-husband team. Works by them with pages are:
- Jack Mc Kinney was Brian Daley and James Luceno. Together they wrote 12 novelizations of Robotech as well as 5 sequels. Additionally, they had several original works.
- K. A. Applegate and Michael Grant co-authored some book series together, but the covers only use Applegate's name:
- Black Trillium by Andre Norton, Marion Zimmer Bradley, and Julian May
- The Edge Chronicles is by Paul Stewart and Chris Riddell
- The Expanse is written by James S. A. Corey, who is, or rather, are, actually collaborators Daniel Abraham and Ty Franck.
- Good Omens is by Terry Pratchett and Neil Gaiman
- The Long Earth is by Terry Pratchett and Stephen Baxter
- The Magisterium is by Holly Black and Cassandra Clare.
- Peter and the Starcatchers is by Dave Barry and Ridley Pearson.
- Player Two Start trilogy written by Ry Senkari and Nivek.
- Red Dwarf: The first two novels were written by "Grant Naylor" (Rob Grant and Doug Naylor), the third by Doug Naylor alone, and the fourth by Rob Grant alone.
- The Spiderwick Chronicles is by Holly Black and Tony DiTerlizzi.
- Sten by Alan Cole and Chris Bunch
- The Wheel of Time series was written by Robert Jordan until his death. Brandon Sanderson wrote the final three books based on the notes and incomplete writings Jordan left behind; those books credit Jordan and Sanderson as co-authors.
- Wrong Time for Dragons by Nick Perumov and Sergey Lukyanenko