Gaya APA

Cassell, K, A., Hiremath, U. (2009). Reference information services 21 st century : an introduction (2nd ed). London: Facet Publishing.

Gaya MLA

Cassell, Kay, Ann., Hiremath, Uma. "Reference information services 21 st century : an introduction". 2nd ed London: Facet Publishing, 2009. Text.