Creating Join Statements

I have the following situation. We sell books on our website, and some
of the books have more than one author. So I needed to create a
many-to-many table, which is the intermidiate table between the author
table and the book table.

I can't get the right join statement to work. I've used the code below,
submitting an isbn (book id number) to identify the book, but the return
from the query simply sends me back all of the authors that are in the
many_to_many table
(called the book_to_author table here). I'd like it to return only the
authors attached to that isbn, instead of all the authors that are in
that table. What's wrong with the code below? Thanks for your help!

SELECT a.firstname, a.lastname, a.title AS degree, a.bio, a.author_id,
bf.isbn, bf.title AS booktitle, m.isbn AS Expr2, m.id, m.author_id AS
Expr3 FROM author a INNER JOIN book_to_author m ON
a.author_id=m.author_id CROSS JOIN book_detail_final bf WHERE
bf.isbn='"&isbn&"' order by m.id desc

Bill

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