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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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Staley, L.: E-mail reference : experiences at City University (1998)
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Still, J.; Campbell, F.: Librarian in a box : the use of electronic mail for reference (1993)
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Bushallow-Wilbur, L.; DeVinney, G; Whitcomb, F.: Electronic mail reference service : a study (1996)
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Meho, L.I.: E-Mail interviewing in qualitative research : a methodological discussion (2006)
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