[Air-L] best intro level org comm book?

I've been asked this question: "Specifically, I am interested to understand better how e-mail affects corporate communications. For example, if i e-mail my boss, my boss's boss, all the way up the ladder, then how does that change the chain of command. Isn't there some element of information protection in a chain of command? I realize we can sit down for quite some time and speak about the implications, but my main question for you is can you direct me to a book or academic publication that can point me in the right direction?" Could those with expertise in this area point me to a solid readable introduction for an interested non-specialist? Thanks Nancy