I hilariously read the 1st edition of this book, printed in the mid-eighties, given to me in San Francisco by my awesome landlady, and dredged off of my bookshelf over a decade later.
But weirdly, its out-of-datenesss (There are these new things called "online bulletin boards" that you might consider using in your marketing) was kind of perfect. It forced me to focus on the big picture, instead of the marketing details, which is precisely where it feels like I need to be right now.
I took lots of notes, got ideas for the website, and it helped codify my plans for a free swim/triathlon clinic offering this spring, so even if it does nothing else for me, it was worth it already.