Não informado. Smithsonian opportunities for research and study in history, art, science. Smithsonian Institution, Board of Academic Studies.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Smithsonian Opportunities for Research and Study in History, Art, Science. Washington: Smithsonian Institution, Board of Academic Studies.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Smithsonian Opportunities for Research and Study in History, Art, Science. Smithsonian Institution, Board of Academic Studies.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.