Não informado. (1990). Personnel Training and Education. Library Association, Personnel Training and Education Group.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Não informado. Personnel Training and Education. London: Library Association, Personnel Training and Education Group, 1990.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Não informado. Personnel Training and Education. Library Association, Personnel Training and Education Group, 1990.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.