Sumanth, D. J. (1984). Productivity engineering and managementproductivity measurement, evaluation, planning, and improvement in manufacturing and service organizationsDavid J. Sumanth. McGraw-Hill.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Sumanth, David J. Productivity Engineering and Managementproductivity Measurement, Evaluation, Planning, and Improvement in Manufacturing and Service OrganizationsDavid J. Sumanth. McGraw-Hill, 1984.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Sumanth, David J. Productivity Engineering and Managementproductivity Measurement, Evaluation, Planning, and Improvement in Manufacturing and Service OrganizationsDavid J. Sumanth. McGraw-Hill, 1984.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.