Saxena,R.S. Information Retrieval Techniques and Reference Sources and Tools in Pure and Applied Sciences / by R.S.Saxena - 1st ed. - Agra: Y.K. Publishers, 1987. - 144p. ISBN: 8185070083 Subjects--Topical Terms: Information RetrievalLibrary ScienceReference ServiceTechniques and Tools Dewey Class. No.: 025.52 / SAX/I