National Research Council (U.S.). Committee on National Statistics, National Research Council (U.S.). Division of Behavioral and Social Sciences and Education, ebrary, Inc, Citro, C. F., Martin, M. E., & Straf, M. L. (2009). Principles and practices for a federal statistical agency (4th ed.). National Academies Press.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)National Research Council (U.S.). Committee on National Statistics, National Research Council (U.S.). Division of Behavioral and Social Sciences and Education, Inc ebrary, Constance F. Citro, Margaret E. Martin, و Miron L. Straf. Principles and Practices for a Federal Statistical Agency. 4th ed. Washington, D.C.: National Academies Press, 2009.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)National Research Council (U.S.). Committee on National Statistics, et al. Principles and Practices for a Federal Statistical Agency. 4th ed. National Academies Press, 2009.