Oelkers, J. Elementary textbooks in the 18th century and their theory of the learning child. Scholarly knowledge : textbooks in early modern Europe.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Oelkers, Jürgen. "Elementary Textbooks in the 18th Century and Their Theory of the Learning Child." Scholarly Knowledge : Textbooks in Early Modern Europe .
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Oelkers, Jürgen. "Elementary Textbooks in the 18th Century and Their Theory of the Learning Child." Scholarly Knowledge : Textbooks in Early Modern Europe, .
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.