This is the primary textbook. It is an econ text that might be used for an MBA course on the economics of organizations. The authors are faculty members at Stanford in the Business School there. The book is available in paperback but not as an eText. It should be in the Campus Bookstore or you can get it online.
This is a complementary text often used in leadership training. It is quite popular for that use. It is there to provide an alternative to the economics approach. It is available in hard cover and in paperback. You can also get it as an eText. It also should be in the Campus Bookstore or you can get it online. Please do get the fourth edition.