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Singh, S.: Ranganathan and reference services (1992)
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Garcia-Suarez, V.M.: ¬El servicio de referencia y el referencista contemporaneos : retos y oportunidades (1995)
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Tyckoson, D.: What we do : reaffirming the founding principles of reference services (1998)
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Berger, C.: Reference service : a thing of the past? (1996)
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Johnson, W.G.: ¬The need for a value-based reference policy : John Rawls at the reference desk (1994)
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