Formal:
* Literary texts
* Literary pieces
* Literary creations
* Written works
* Literary compositions
* Canonical works (if referring to well-known, important works)
Informal:
* Books
* Stories
* Writings
* Classics
* Masterpieces (if referring to highly acclaimed works)
* Reading material
More specific:
* Novels
* Poems
* Plays
* Essays
* Short stories
* Journalism
The best option depends on the specific context and the desired level of formality.