Cassell, K. A., & Hiremath, U. (2009). Reference and information services in the 21st century: An introduction (Second edition.). Facet.
توثيق أسلوب شيكاغو (الطبعة السابعة عشر)Cassell, Kay Ann, و Uma Hiremath. Reference and Information Services in the 21st Century: An Introduction. Second edition. London: Facet, 2009.
توثيق جمعية اللغة المعاصرة MLA (الطبعة الثامنة)Cassell, Kay Ann, و Uma Hiremath. Reference and Information Services in the 21st Century: An Introduction. Second edition. Facet, 2009.
تحذير: قد لا تكون هذه الاستشهادات دائما دقيقة بنسبة 100%.