Patrick, T. B., Demiris, G., Folk, L. C., Moxley, D. E., Mitchell, J. A., & Tao, D. (2004). Journal of the Medical Library Association: JMLA, 92(2), 196-199.
Report from the European Observatory on Health Systems and Policies.
E-Text available through the National Library of Medicine by Clifford S. Goodman, Ph.D
Stevens, A., Milne, R., Lilford, R., & Gabbay, J. (1999). BMJ, 319(7220), 1291.
Rosen, R., & Gabbay, J. (1999). BMJ, 319(7220), 1292.
Perry, S., & Thamer, M. (1999). JAMA, 282(19), 1869-1872.