Which Warcraft books and manga are concurrent with the history and which are wrong?

Chris Metzen, creator of World of Warcraft and writer of its main storyline, holds a very tight leash on the content and continuity of the books and mangas being published. As such, any of the official books and mangas (such as the Sunwell Trilogy and the books written by Richard Knaak) can be considered Canon.

However, keep in mind that there is a difference between "not according to known lore" and "told from a different point of view". That is to say, events that happen in books and comics will be colored by the viewpoint of the characters in it. This does not mean that it is not correct, merely that it tells a different side of the same story.