def _parse_title_url(html_chunk):
    """
    Parse title/name of the book and URL of the book.

    Args:
        html_chunk (obj): HTMLElement containing slice of the page with details.

    Returns:
        tuple: (title, url), both as strings.
    """
    title = html_chunk.find("div", {"class": "comment"})

    if not title:
        return _parse_alt_title(html_chunk), None

    title = title[0].find("h2")
    if not title:
        return _parse_alt_title(html_chunk), None

    # look for the url of the book if present
    url = None
    url_tag = title[0].find("a")
    if url_tag:
        url = url_tag[0].params.get("href", None)
        title = url_tag

    return title[0].getContent(), normalize_url(BASE_URL, url)