diff --git a/core/modules/book/migration_templates/d6_book.yml b/core/modules/book/migration_templates/d6_book.yml
index dca43b1..4150094 100644
--- a/core/modules/book/migration_templates/d6_book.yml
+++ b/core/modules/book/migration_templates/d6_book.yml
@@ -3,7 +3,7 @@ label: Books
 migration_tags:
   - Drupal 6
 source:
-  plugin: d6_book
+  plugin: book
 process:
   nid: nid
   'book/bid': bid
@@ -21,3 +21,4 @@ destination:
 migration_dependencies:
   required:
     - d6_node:*
+    - d6_menu_links
diff --git a/core/modules/book/src/Plugin/migrate/source/d6/Book.php b/core/modules/book/src/Plugin/migrate/source/d6/Book.php
deleted file mode 100644
index 86fdeee..0000000
--- a/core/modules/book/src/Plugin/migrate/source/d6/Book.php
+++ /dev/null
@@ -1,68 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\book\Plugin\migrate\source\d6\Book.
- */
-
-namespace Drupal\book\Plugin\migrate\source\d6;
-
-use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
-
-/**
- * Drupal 6 book source.
- *
- * @MigrateSource(
- *   id = "d6_book"
- * )
- */
-class Book extends DrupalSqlBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function query() {
-    $query = $this->select('book', 'b')->fields('b', array('nid', 'bid'));
-    $query->join('menu_links', 'ml', 'b.mlid = ml.mlid');
-    $ml_fields = array('mlid', 'plid', 'weight', 'has_children', 'depth');
-    for ($i = 1; $i <= 9; $i++) {
-      $field = "p$i";
-      $ml_fields[] = $field;
-      $query->orderBy($field);
-    }
-    $query->fields('ml', $ml_fields);
-    return $query;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function getIds() {
-    $ids['mlid']['type'] = 'integer';
-    $ids['mlid']['alias'] = 'ml';
-    return $ids;
-  }
-
-  /**
-   * {@inheritdoc}
-   */
-  public function fields() {
-    return array(
-      'nid' => $this->t('Node ID'),
-      'bid' => $this->t('Book ID'),
-      'mlid' => $this->t('Menu link ID'),
-      'plid' => $this->t('Parent link ID'),
-      'weight' => $this->t('Weight'),
-      'p1' => $this->t('The first mlid in the materialized path. If N = depth, then pN must equal the mlid. If depth > 1 then p(N-1) must equal the parent link mlid. All pX where X > depth must equal zero. The columns p1 .. p9 are also called the parents.'),
-      'p2' => $this->t('The second mlid in the materialized path. See p1.'),
-      'p3' => $this->t('The third mlid in the materialized path. See p1.'),
-      'p4' => $this->t('The fourth mlid in the materialized path. See p1.'),
-      'p5' => $this->t('The fifth mlid in the materialized path. See p1.'),
-      'p6' => $this->t('The sixth mlid in the materialized path. See p1.'),
-      'p7' => $this->t('The seventh mlid in the materialized path. See p1.'),
-      'p8' => $this->t('The eighth mlid in the materialized path. See p1.'),
-      'p9' => $this->t('The ninth mlid in the materialized path. See p1.'),
-    );
-  }
-
-}
diff --git a/core/modules/book/tests/src/Unit/Plugin/migrate/source/d6/BookTest.php b/core/modules/book/tests/src/Unit/Plugin/migrate/source/d6/BookTest.php
deleted file mode 100644
index ffd98e1..0000000
--- a/core/modules/book/tests/src/Unit/Plugin/migrate/source/d6/BookTest.php
+++ /dev/null
@@ -1,90 +0,0 @@
-<?php
-
-/**
- * @file
- * Contains \Drupal\Tests\book\Unit\Plugin\migrate\source\d6\BookTest.
- */
-
-namespace Drupal\Tests\book\Unit\Plugin\migrate\source\d6;
-
-use Drupal\book\Plugin\migrate\source\d6\Book;
-use Drupal\Tests\migrate\Unit\MigrateSqlSourceTestCase;
-
-/**
- * @coversDefaultClass \Drupal\book\Plugin\migrate\source\d6\Book
- * @group book
- */
-class BookTest extends MigrateSqlSourceTestCase {
-
-  const PLUGIN_CLASS = Book::class;
-
-  protected $migrationConfiguration = array(
-    'id' => 'test',
-    'source' => array(
-      'plugin' => 'd6_book',
-    ),
-  );
-
-  protected $expectedResults = array(
-    array(
-      'nid' => '4',
-      'bid' => '4',
-      'mlid' => '1',
-      'plid' => '0',
-      'weight' => '-10',
-      'p1' => '1',
-      'p2' => '0',
-      'p3' => '0',
-      'p4' => '0',
-      'p5' => '0',
-      'p6' => '0',
-      'p7' => '0',
-      'p8' => '0',
-      'p9' => '0',
-    ),
-  );
-
-  /**
-   * {@inheritdoc}
-   */
-  protected function setUp() {
-    $this->databaseContents['book'] = array(
-      array(
-        'mlid' => '1',
-        'nid' => '4',
-        'bid' => '4',
-      ),
-    );
-    $this->databaseContents['menu_links'] = array(
-      array(
-        'menu_name' => 'book-toc-1',
-        'mlid' => '1',
-        'plid' => '0',
-        'link_path' => 'node/4',
-        'router_path' => 'node/%',
-        'link_title' => 'Test top book title',
-        'options' => 'a:0:{}',
-        'module' => 'book',
-        'hidden' => '0',
-        'external' => '0',
-        'has_children' => '1',
-        'expanded' => '0',
-        'weight' => '-10',
-        'depth' => '1',
-        'customized' => '0',
-        'p1' => '1',
-        'p2' => '0',
-        'p3' => '0',
-        'p4' => '0',
-        'p5' => '0',
-        'p6' => '0',
-        'p7' => '0',
-        'p8' => '0',
-        'p9' => '0',
-        'updated' => '0',
-      ),
-    );
-    parent::setUp();
-  }
-
-}