Paul, Richard. Critical thinking : tools for taking charge of your learning and your life / Richard Paul, Linda Elder. - Fourth edition - xIix, 590 pages : illustrations ; 23 cm. Includes bibliographical references and index. LCCN: 2011003890 Subjects--Topical Terms: Critical thinking. LC Class. No.: B809.2 / .P38 2012 Dewey Class. No.: 153.4/2