Answer
Concerning who wrote the book of Joshua, we have to realize that the book is anonymous first of all, first and foremost. Beyond that, we can see writing that's actually going on in the book. So, we see writing on the stones; we see writing in the book of the law; we see writing of land surveys, even, in the book. So, we see writing happening during the time of Joshua, but there's nothing that absolutely makes us believe that Joshua himself was sitting down writing the book of Joshua… But we do want to take seriously the claims of the book and the claims of the writing in the book and say that where things are being written that they're actually being written.