The Annals of Light and Shadow

The Annals of Light and Shadow are a series of 12 volumes that can be traded to Archivist Inkforge in Netherlight Temple for Writings of the End.

Source
The 12 copies of this item can be found across Azeroth. Artifact Knowledge Level 4 is required to obtain them, and there appears to be a respawn timer on each volume.

Netherlight Temple

 * Talk to Archivist Inkforge. This starts the task to collect all the volumes.
 * On a bookshelf to the left of Meridelle Lightspark.
 * On the table behind Juvess the Duskwhisperer.

Dalaran

 * On a bookshelf next to Archivist Elysiana in the Violet Citadel.