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Curle, D.: There's no value if it's not relevant : Online information pricing will make sense when online products do (1998)
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Rowley, J.: Issues in multiple use and network pricing for CD-ROMs (1995)
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Benkowsky, J.; Bühring, B.; Georgy, U.; Linde, F.: Information pricing : the development of a product- and pricing concept for the research centre of the Public Library Cologne (2005)
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Langer, P.; Wilson, A.J.C.: Online user needs in chemical information (1994)
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Flynn, M.: Marketing a fee-based information service : the case of BTiS (1994)
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