How to list all artists from micro SHDC card?

I have a 16g micro sdhc card with all audiobooks.  When I go to music>artists>  not all the authors get listed but can be found in the “[” icon at the bottom.  In one case, I have 3 audiobooks from the same author and two of the 3 books can be found when I do the artists search but his third book is not (and is in the “[” section)

I put all my audiobooks in the music folder because it makes it easier to look for a book by author as opposed to trying to remember what the title is.