Gordon, Thomas 1918- Leader effectiveness training, L.E.T.: proven skills for leading today's business into tomorrow/ Thomas Gordon. - New York, N.Y.: Berkley Pub. Group, 2001. - xi, 307 p.: ill.; 21 cm. "A Perigee book." Includes index. ISBN: 0399527133 Subjects--Topical Terms: Executive ability.Leadership.Organizational behavior.