Randy is doddering and wrong about a great many things. I would take it with more salt than Cullen's book and I wouldn't disagree with taking his with some either. Brooks's book is online: [You must be registered and logged in to see this link.]
I really think all the books make the error of thinking the cafeteria bombs jointly failed at 11:17, nor do any do the library massacre properly. Several don't even have a section dedicated to it.
Jeff Kass's book is probably the best in English. Tim Krabbe's is probably the best period. But with the above caveats, and others I don't give so as not to ramble.
They're both inferior to the 11k, which is really the best answer.
You can also see the list of the books on the wikipedia - I put them there.