Ji FU quoted The Productivity Project by Chris Bailey
After earning his business degree, Chris Bailey turned down several lucrative job offers to pursue …
To save you some time, I've put together a chart that has everything you need to track your time and energy levels for one week. Just head on over to the website for this book --productivityprojectbook.com--to download and print off the chart!
— The Productivity Project by Chris Bailey (Page 51)
Having a dedicated URL for tidbits like this is really nice to your reader. What is not really nice is if you don't maintain the domain. Your book is going to be around longer than your webpage is. If you aren't willing to properly keep up with that don't do it. At least redirect to the Wayback machine or another archive. Mywebsite.com/book/info is probably easier to support long term than mybookinfowebsite.com. I spent way too much time between a search engine and the wayback machine finding what he had that I would have been more productive if I produced it from scratch (no pun intended).