Cassell, K. A., & Hiremath, U. (2011). Reference and information services in the 21st century: An introduction (2nd ed. rev.). Neal-Schuman Publishers.
Lua i Stíl Chicago (17ú heag.)Cassell, Kay Ann, agus Uma Hiremath. Reference and Information Services in the 21st Century: An Introduction. 2nd ed. rev. New York: Neal-Schuman Publishers, 2011.
Lua MLA (9ú heag.)Cassell, Kay Ann, agus Uma Hiremath. Reference and Information Services in the 21st Century: An Introduction. 2nd ed. rev. Neal-Schuman Publishers, 2011.
Rabhadh: Seans nach mbeach na luanna seo go hiomlán cruinn i ngach uile chás.