1:N association populate foreign key

I have Authors and Books model setted like:
Books belongsTo Authors and Authors hasMany Books.

Books table have various field, most intersting:
id (PK)
author_id (FK for authors table)
title
and so on.

This is the view when I want to add a book:
<?php
echo $form->create('Book');

echo $form->input('Book.author_id', array( 'type' => 'select',
'multiple'=>false, 'label' => 'Choice the right author:' ));

echo "<br />";
echo $form->input('Book.title', array('maxLength' => 150, 'type'
=> 'text', 'label' => 'Book title:' ));

// ...
echo $form->end('Save Album');
?>

and add function in books_controller.php
<?php
function add()
{
$this->set('authors', $this->Author->find('list'));
if (!empty($this->data))
{
debug($this->data);
if ($this->Book->save($this->data))
{
$this->Session->setFlash('Your book has been saved.');
$this->redirect(array('action'=>'index'));
}
else
{
$this->Session->setFlash("An error has occured, check
all form fields.");
}
}
}
?>

debug($this->data) return this outupt:
Array
(
[_Token] => Array
(
[key] => 3b4bdf...c0a4373f
[fields] => 391875c...7D
)
[Book] => Array
(
[author_id] => Array
(
[0] => 13
)
[title] => my Title
)
)

I have two questions:
1. How can I add 13 correctly in author_id field??? I have error: SQL
Error: 1054: Unknown column 'Array' in 'field list' Why author id
array has this nested form?
2. What is the _Token array? How can I use it?

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