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Cloughley, K.: Digital reference services : how do the library-based services compare with the expert services? (2004)
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Numminen, P.; Vakkari, P.: Question types in public libraries' digital reference service in Finland : comparing 1999 and 2006 (2009)
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Pomerantz, J.: ¬A linguistic analysis of question taxonomies (2005)
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Purves, R.S.; Winter, S.; Kuhn, W.: Places in information science (2019)
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Janes, J.; Hill, C.; Rolfe, A.: Ask-an-expert services analysis (2001)
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