The previous page is sending you to https://www.thriftbooks.com/w/the-essence-of-security/7888427/item/23915072/?isbn=B000NU4EJK&idiq=23915072&srsltid=AfmBOopo2wQQsKfoffgRXJWwa3zBX7EfqoA8_EpZcJfyC8dE0LN9iAv6iSw.

 If you do not want to visit that page, you can return to the previous page.