Modern 2011 republication of a sociological and social psychology classic. New Preface by the author and an extensive and analytical new Foreword by MIT's Gary Marx. An authorized and quality edition--not just scanned and forgotten like most such reprints today--this book is part of the Classics of the Social Sciences Series by Quid Pro Books. Includes original tables, index, and extensive bibliography (even updating references for the new Foreword). Original page numbers are embedded for continuity of citations and syllabus. This is the golden anniversary edition of the foundational study in its field.