Jehring, J. (1962). Solving problems of productivity in a free society. University of Wisconsin, School of Commerce, Center for Productivity Motivation.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Jehring, J.J. Solving Problems of Productivity in a Free Society. Madison: University of Wisconsin, School of Commerce, Center for Productivity Motivation, 1962.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Jehring, J.J. Solving Problems of Productivity in a Free Society. University of Wisconsin, School of Commerce, Center for Productivity Motivation, 1962.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.