Generally speaking, when it comes to reference works, you can judge them on 3 things: the topics covered, how well they’re written, and their bibliography.
If they deal with the same topics as other books on the same subject, they need to do so better, more in-depth, or from a different perspective.
If they’re not written well, whatever information they impart will be filtered through the bad writing.
If they cite the same sources as other similar works, then the other two elements are even more important.
It is my goal, in writing each of my books, to exceed the expectations of the readers in all three areas.
So, if there are any topics you want to see covered or any books or websites that you believe are essential or even just very helpful, please feel free to let me know.