Do you get queasy any time rioters appear on TV newscasts? Do you assume their actions are working against whatever worthy cause they espouse? Then you should read Stephen D'Arcy's Languages Of The Unheard by ($24.95, Between the Lines). By distinguishing among different types of violence, militancy and riots - yet quoting Martin Luther King Jr. along the way - D'Arcy makes the provocative claim that certain forms of militant protest make visible the injustices that are too easy to ignore. D'Arcy launches the book at No One Writes to the Colonel on Wednesday (February 19). See Readings.