Books can be attributed to "Anonymous" for several reasons:
* They are officially published under that name * They are traditional stories not attributed to a specific author * They are religious texts not generally attributed to a specific author
Books whose authorship is merely uncertain should be attributed to Unknown.
In my opinion, maybe the best Dutch translation of the Bible. In any case, a very decent one that seeks to find a balance between preserving text characteristics (e.g. poetry is always indented) and being literal on the one hand, and making sure that the meaning of the text comes across well, on the other hand.
I happen to have bought an edition that includes the Deuterocanonical books, but I didn't actually read them.