American Historical Association. Commission on the Social Studies in the Schools, Krey, August Charles, & Beard, C. A. (1932). A charter for the social sciences in the schools. Scribner's Sons.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)American Historical Association. Commission on the Social Studies in the Schools, August Charles Krey, و Charles Austin Beard. A Charter for the Social Sciences in the Schools. New York: Scribner's Sons, 1932.
توثيق جمعية اللغة المعاصرة MLA (الإصدار التاسع)American Historical Association. Commission on the Social Studies in the Schools, et al. A Charter for the Social Sciences in the Schools. Scribner's Sons, 1932.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.