You need to track what each book (title) is making you per month total from all the sites. (deanwesleysmith.com)
It's a very stable index with about a one - month lag due to it's price being based on the prior months total annual average of interest on deposit accounts. (thetruthaboutmortgage.com)
Many months the total interaction is texting a reminder to deposit the rent and checking the bank to see it's there. (biggerpockets.com)