Helms, P. J., Daukes, S. E., Taylor, M. W., Simpson, C. R., & McLay, J. S. (2005). Utility of routinely acquired primary care data for paediatric disease epidemiology and pharmacoepidemiology. Blackwell Science Inc.

Helms, Peter J., Suzie Ekins Daukes, Michael W. Taylor, Colin R. Simpson, και James S. McLay. Utility of Routinely Acquired Primary Care Data for Paediatric Disease Epidemiology and Pharmacoepidemiology. Blackwell Science Inc, 2005.

Helms, Peter J., et al. Utility of Routinely Acquired Primary Care Data for Paediatric Disease Epidemiology and Pharmacoepidemiology. Blackwell Science Inc, 2005.