Definition of Program Areas in the National Study of Postsecondary Faculty. US Department of Education.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Definition of Program Areas in the National Study of Postsecondary Faculty. US Department of Education.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Definition of Program Areas in the National Study of Postsecondary Faculty. US Department of Education.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.