5Abby S. Kasowitz. Trends and issues in digital reference services. http://www.ericit.org.
6Butler Brett. KnowledgeBit : A database format for reference version 2.0. http:/www. vrd. org.
7Marsh Geoffrey. A help desk knowledge database : the first year.http ://csb. dcrt. nih. gov/kbwhite/firstyear/index. html.
8Streenivasulu V. The role of a digital librarian in the management of digital information systems (DIS). http://www. mcb. co. uk/protfolio/pdfs/el1. pdf.
9Penka J T. The Technological Challenges of Digital Reference: An Overview. D-Lib Magazine, 2003, 9(2).
10Kasowitz A S. Trends and Issues in Digital Refcrcnce Services.ERIC Digest, November 2001.