CRED Example

add_action('cred_save_data', 'my_save_data_action',10,2);
function my_save_data_action( $post_id, $form_data ) {

    // if a specific form
    if ( $form_data['id'] == 95 ) {

        $book_content = get_post( $post_id );
        $summary = get_post_meta( $post_id, 'wpcf-summary', true );
        $authors = get_the_terms( $post_id, 'book-authors' );

        //get authors
        $auth = array();
        foreach( $authors as $author ) {
            $auth[] = $author->name;
        }

        //insert the post
        wp_insert_post( array(
            'post_title' => sprintf( 'New book is now available: %s', $book_content->post_title ),
            'post_status' => 'publish',
            'post_content' => sprintf( 'A new book has been added, %s by %s. <br /><br /><strong>Summary:</strong> %s', $book_content->post_title, join(', ', $auth ), $summary )
        ) );

    }

}