Hutchings, H., Lyons, R., Wareham, K., Hutchings, H., Major, E., Ferguson, B., & Lyons, R. (2000). Population requirement for adult critical-care beds: A prospective quantitative and qualitative study. The Lancet, 355(9204), pp. 595-598. doi:10.1016/S0140-6736(00)01265-4

Hutchings, Hayley, RA Lyons, K. Wareham, HA Hutchings, E. Major, B. Ferguson, and Ronan Lyons. "Population Requirement for Adult Critical-care Beds: A Prospective Quantitative and Qualitative Study." The Lancet 355, no. 9204 (2000): 595-598.

Hutchings, Hayley, et al. "Population Requirement for Adult Critical-care Beds: A Prospective Quantitative and Qualitative Study." The Lancet 355.9204 (2000): 595-598.