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Balas, J.: Building virtual libraries (1996)
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Fishman, D.L.: Managing the virtual reference desk : how to plan an effective reference e-mail system (1998)
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Lagace, N.: ¬The Internet Public Library's 'Ask a question worldwide reference service' (1998)
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Burg, B.; Tallent, E.: SilverPlatter's Electronic Reference Library (ERL) (1995)
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Information services policy manual : an outline (1994)
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