Legal Question in Intellectual Property in Washington

You can properly use trademarks in book titles, just like the 'For Dummies' series uses literally hundreds of trademarks in its book titles.

You cannot use the 'For Dummies' trademark in a book title because that would cause consumer confusion about who is creating that book: The Dummies people or you.

Putting it together, For Dummies can write a book called Google Adsense for Dummies. (That is a real book.) That uses Google's trademark, but there is no consumer confusion as there is no claim it was written by Google.

I can write a book titled: Preston Merkel's Guide to Making Money With Google.

It could be a different matter if I wrote a book titled: Google's Official Guide to Making Money.

Of course, include proper disclaimers and a notice as to who owns the Google trademark.

Don't confuse 'regular' trademark law with what you may otherwise read about on this forum, and elsewhere, about domain names. Domain names are a separate category unto themselves because of a concept referred to as initial consumer confusion about who owns a domain before it is visited. It has lesser application to books.