orality versus Legality: Historical Analysis of the Motivating Factors of Social Conduct）取得哲学博士学位，奠定其社会心理学在理论与实践的基础。博士论文于1933年由英国Kegan Paul, Trench, Trubner出版社以《个人与共同体：社会行为动因的历史分析》（The Individual and the Community：A Historical Analysis of the Motivating F