If your boss gave you this book with the honest intention to hear you opinion and share ideas, just be sincere and say what you said here: "It presents no arguments, is severely lacking in any sort of citations..." and the rest. You say that it's garbage without explicitly saying it. It may even give birth to a real interchange of ideas. Mentioning the books you liked instead may even prove positive for everybody involved.

If, on the contrary, it's the usual material from crappy bosses that only want to reaffirm themselves in their bossy bullshit, just tell them that it was "very remarkable and with very enlightening ideas" and move on.