Não informado. (1926). Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Bulletin of the National Association of Secondary School Principals. Washington: National Association of Secondary School Principals, 1926.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Bulletin of the National Association of Secondary School Principals. National Association of Secondary School Principals, 1926.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.