Isaac, S. (1971). Handbook in research and evaluation: A collection of principles, methods, and strategies useful in the planning, design, and evaluation of studies in education and the behavioral sciences. R. R. Knapp.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Isaac, Stephen. Handbook in Research and Evaluation: A Collection of Principles, Methods, and Strategies Useful in the Planning, Design, and Evaluation of Studies in Education and the Behavioral Sciences. San Diego, Calif: R. R. Knapp, 1971.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)Isaac, Stephen. Handbook in Research and Evaluation: A Collection of Principles, Methods, and Strategies Useful in the Planning, Design, and Evaluation of Studies in Education and the Behavioral Sciences. R. R. Knapp, 1971.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.