Book recs on language change

I'm trying to turn Mungayöd into an "ancestor" language, much like Latin
is in our world. Unfortunately, my understanding of language change is
not too strong. Can anyone recommend me some good, thorough books to
read on the subject?

Thanks.

--
Dan Seriff <microtonal@...>

"Mozart is just God's way of making the rest of us feel inferior."
        - David Barber