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3. Troll, D.A. (2001), “How and why are libraries changing?”, white paper commissioned by the Digital Library Federation (DLF), available at: www.clir.org/diglib/use.htm Revised and published in 2002 as “How and why libraries are changing: what we know and what we need to know”, portal:Libraries and the Academy, Vol. 2 No. 1, pp. 97‐121.
4. Troll Covey, D. (2002),Usage and Usability Assessment: Library Practices and Concerns, Council on Library and Information Resources, Washington DC, January, available at: www.clir.org/pubs/reports/pub105/pub105.pdf