We call it the "Book of Mormon" even though it is an abridgement of multiple sources, combined with commentary by Mormon.
How is that any different than calling the Pentateuch the "Books of Moses"? Couldn't have Moses simply aggregated some of the source material that is in the Pentateuch and then the remainder of the Pentateuch was either written by him or about him? As such, they can be generically referred to as the Books of Moses since he had varying degrees of involvement with them.
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