function cwc_restrict_manage_authors() {
        if (isset($_GET['post_type']) && post_type_exists($_GET['post_type']) && in_array(strtolower($_GET['post_type']), array('your_custom_post_types', 'here'))) {
                wp_dropdown_users(array(
                        'show_option_all'       => 'Показать всех авторов',
                        'show_option_none'      => false,
                        'name'                  => 'author',
                        'selected'              => !empty($_GET['author']) ? $_GET['author'] : 0,
                        'include_selected'      => false
                ));
        }
}
add_action('restrict_manage_posts', 'cwc_restrict_manage_authors');