Não informado. (1991). Training and Development. American Society for Training and Development.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Training and Development. Alexandria, Va: American Society for Training and Development, 1991.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Training and Development. American Society for Training and Development, 1991.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.