There are lots of sources, the article briefly covers many of them. They all share in common the fact that there is very little real information and so we can only read behind the lines at trying to find the truth. Devereaux is one of the few takes that admit to this problem, and for that alone is makes him my favored source. It quickly becomes clear if you read these that most takes on the Spartans are using the lack of information to read some favored angle.

I'd be interested in another historian's take if different. I'm reasonably confident that they will be similar to Devereaux's take though, so I'm not looking.