7Douglas Z. "With Our Eye on the User:Needed Research for Information and Referral in the Public Library ." Drexel Library Quarterly 12(Jan. 1976) :48 - 58
8Christopher M.M,Vanaja Menon. Customer Expectations:Con cepts and Reality for Academic Library Services[J]. College & Research Libraries, 1995,56( 1 ): 33 - 47
