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Singh, S.: Ranganathan and reference services (1992)
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Singh, S.: From reference to information services : a study on impact of Ranganathan (1992)
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Whitlatch, J.B.: Customer service : implications for reference practice (1995)
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Bicknell, T.: Focusing on quality reference service (1994)
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Song, S.-f.: Rethinking of the development of reference service (1997)
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