The book manager. Type:

public BookOutlineStorage::__construct(Connection $connection)

The node storage. Type:

public BookOutline::nextLink(array $book_link)

public BookRemoveForm::getConfirmText()

protected BookManager::buildBookOutlineRecursive(&$links, $parents,

The node representing the book. Type:

public BookController::adminOverview()

Configure book settings for this site. Hierarchy class \Drupal\Core\Form\

public BookManager::deleteFromBook($nid) Deletes