diff --git a/core/modules/book/migrations/d6_book.yml b/core/modules/book/migrations/d6_book.yml
index 3036e1f..f8cf2a7 100644
--- a/core/modules/book/migrations/d6_book.yml
+++ b/core/modules/book/migrations/d6_book.yml
@@ -21,4 +21,3 @@ destination:
 migration_dependencies:
   required:
     - d6_node
-    - d6_menu_links
diff --git a/core/modules/book/migrations/d7_book.yml b/core/modules/book/migrations/d7_book.yml
index e46df60..4301f72 100644
--- a/core/modules/book/migrations/d7_book.yml
+++ b/core/modules/book/migrations/d7_book.yml
@@ -21,4 +21,3 @@ destination:
 migration_dependencies:
   required:
     - d7_node
-    - d7_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
index 76d9b6a..1fe00bc 100644
--- a/core/modules/book/src/Plugin/migrate/source/d6/Book.php
+++ b/core/modules/book/src/Plugin/migrate/source/d6/Book.php
@@ -1,64 +1,20 @@
 <?php
 
-namespace Drupal\book\Plugin\migrate\source;
+namespace Drupal\book\Plugin\migrate\source\d6;
 
-use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;
+use Drupal\book\Plugin\migrate\source\Book as BookGeneral;
+
+@trigger_error('Book is deprecated in Drupal 8.6.x and will be removed before Drupal 9.0.x. Use \Drupal\book\Plugin\migrate\source\Book instead.', E_USER_DEPRECATED);
 
 /**
- * Drupal book source.
+ * Drupal 6 book source.
  *
  * @MigrateSource(
- *   id = "book",
+ *   id = "d6_book",
  *   source_module = "book"
  * )
+ *
+ * @deprecated in Drupal 8.6.x, to be removed before Drupal 9.0.x. Use
+ * \Drupal\book\Plugin\migrate\source\Book instead.
  */
-class Book extends DrupalSqlBase {
-
-  /**
-   * {@inheritdoc}
-   */
-  public function query() {
-    $query = $this->select('book', 'b')->fields('b', ['nid', 'bid']);
-    $query->join('menu_links', 'ml', 'b.mlid = ml.mlid');
-    $ml_fields = ['mlid', 'plid', 'weight', 'has_children', 'depth'];
-    for ($i = 1; $i <= 9; $i++) {
-      $field = "p$i";
-      $ml_fields[] = $field;
-      $query->orderBy('ml.' . $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 [
-      '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.'),
-    ];
-  }
-
-}
+class Book extends BookGeneral {}
diff --git a/core/modules/book/tests/src/Kernel/Migrate/d7/MigrateBookTest.php b/core/modules/book/tests/src/Kernel/Migrate/d7/MigrateBookTest.php
index cc0f7bb..e850521 100644
--- a/core/modules/book/tests/src/Kernel/Migrate/d7/MigrateBookTest.php
+++ b/core/modules/book/tests/src/Kernel/Migrate/d7/MigrateBookTest.php
@@ -38,7 +38,6 @@ protected function setUp() {
       'd7_user',
       'd7_node_type',
       'd7_node',
-      'd7_menu_links',
       'd7_book'
     ]);
   }