Information sources--Kinds of reference books and their evaluation--Dictionaries--Encyclopaedias--Ready reference sources--statistical sources--Geographical sources--Biographical sources--Indexing sources and services--Abstracting sources and services--Bibliographies--Patents and standards--Non-documentary sources of information--Electronic Digital Information soueces(E-sources)--Internet as source of Information--Reference services--reference services in different types of libraries--organisation of reference section--role of reference librarian/Information officer in electronic environment--concept and need for information--information services: an overview--Translation services--Literature search services--Document Delivery services(DDS) and Electronic Document Delivery services(EDDS)--Current awareness service(CAS)--Selective Dissemination of Information(SDI)--Reprographic service--Documentation/Inforamtion centres--National Documentation centres--computer based information services--Information literacy programmes--user and their information needs--Information system--