From the book to be archived
From the book settings, click on Archive book, at the very bottom of the page:
You will be given an extra option upon archiving the book, that is whether or not to continue receiving notification from the said book:
Uncheck the box if you do not wish to receive any further notifications.
Once you've made your choice, click on to confirm, or to go back.
Note: If you have chosen to continue receiving notifications, you will receive them as messages in the book TimeTonic Notifications & Inbox.
From the home screen :