Copyright registration is enough. If it is not used for commercial activities, there is no need to register it as a trademark, because there are many categories of trademarks, and the registration of all categories requires a lot of money. In addition, trademark registration shall not damage prior rights. If your copyright is prior and the title of the book is original, then the registered trademark, as the copyright owner, can raise an objection to the Trademark Office, which will generally be rejected. Check with the State Trademark Office every once in a while.