León, J., & Collahua, Y. (2015). Technical note 33: The reliability and validity of achievement tests in the second Young Lives school survey in Ethiopia. Young Lives.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)León, J., و Y. Collahua. Technical Note 33: The Reliability and Validity of Achievement Tests in the Second Young Lives School Survey in Ethiopia. Young Lives, 2015.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)León, J., و Y. Collahua. Technical Note 33: The Reliability and Validity of Achievement Tests in the Second Young Lives School Survey in Ethiopia. Young Lives, 2015.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.