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The college libraries are playing a vital role in providing the required information to the users of engineering. Libraries earlier with their various kinds of print information sources such as books, journals, conference proceedings, pamphlets, standards, patents, etc, were providing information services to their users. But due to the developments in Information and Communication Technology, the new type of documents known as e-sources came into existence in libraries in addition to the already existing print documents. The information in these types of documents is stored in digital form. The various categories of e-sources are e-books, e-journals, online full text databases, online bibliographical databases, e-theses and dissertation, web OPAC, e-magazines, e-news etc. These are available either as DVDs, CD-ROMs and blue ray discs or online sources. These e-sources are facilitating information storage, processing and retrieval much faster than traditional print documents. If became inevitable for procure these sources to provide exhaustive and up-to-date information to the users.

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Andala Palli, Hari Prasad Reddy
Dr. A. Hari Prasad Reddy is librarian working since 2003 at Acharya Nagarjuna University PG Center, Ongole. He completed M.A,M.L.I.Sc,M.Phil,from Alagappa University and Ph.D degree from Rayalaseema University,A.P. His research interest areas is on e-sources.He has been published nine articles at National level.This book is dedicated to my parents

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