Urgent: two authors for the same book

Question

I have a database with three tables: books, authors and aux.
The books table stores the names of the books. The authors table stores the name of the authors. Table aux takes the id of the other two. I did this for the case of the same book has two or more authors
The query I did was the following:
SELECT authores.author, books.title
FROM aux, authors, books
WHERE aux.books_id = books.id AND aux.authors_id = authors.id
ORDER BY books.title ASC
How do I show the two authors for the same book?
For now, I'm using a simple table:
<table border="1" cellpadding="1" cellspacing="1">
  <tr>
    <td>author</td>
    <td>title</td>
  </tr>
  <?php do { ?>
    <tr>
      <td><?php echo $row_rsBooks['author']; ?></td>
      <td><?php echo $row_rsBooks['title']; ?></td>
    </tr>
    <?php } while ($row_rsBooks = mysql_fetch_assoc($rsBooks)); ?>
</table>
Thus, the table presents two results for the same book, instead of uniting the two authors of the same book.

Answer 1

Thanks for the reply.
In the meantime, got what I wanted. The expression looks like this:
SELECT livros.titulo, GROUP_CONCAT(autores.autor SEPARATOR ',') AS Autores
FROM livros INNER JOIN aux ON aux.livros_id = livros.id INNER JOIN autores ON aux.autores_id = autores.id
GROUP BY livros.titulo