Three books on the entrepreneurial experience are worth the read, says New York Times columnist Paul B. Brown. "A Whack on the Side of the Head" (Business Plus, $16.99) by Roger von Oech helps people think differently by learning how to break certain "mental blocks" that promote the status quo. "The One Minute Entrepreneur" (Doubleday Business, $19.95) by Ken Blanchard, Don Hutson and Ethan Willis has an upbeat message that if you work right, on the right things, you will succeed. "How to Get Rich: One of the World's Greatest Entrepreneurs Shares His Secrets" (Portfolio Hardcover, $25.95) by Felix Dennis offers several warnings to entrepreneurs based on the author's failings.