United States. Office of Education, National Institute of Education, & Harrison, S. A. (1975). Improving instructional productivity in higher education. Educational Technology Pub.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)United States. Office of Education, National Institute of Education, و Shelley A. Harrison. Improving Instructional Productivity in Higher Education. Englewood Cliffs, N. J: Educational Technology Pub, 1975.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)United States. Office of Education, et al. Improving Instructional Productivity in Higher Education. Educational Technology Pub, 1975.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.