Campbell, H., Amirthalingam, G., Fry, N. K., Litt, D., Harrison, T. G., Wagner, K., . . . Miller, E. (2014). Oral Fluid Testing for Pertussis, England and Wales, June 2007–August 2009. Centers for Disease Control and Prevention.

Campbell, Helen, Gayatri Amirthalingam, Norman K. Fry, David Litt, Timothy G. Harrison, Karen Wagner, Natasha S. Crowcroft, and Elizabeth Miller. Oral Fluid Testing for Pertussis, England and Wales, June 2007–August 2009. Centers for Disease Control and Prevention, 2014.

Campbell, Helen, et al. Oral Fluid Testing for Pertussis, England and Wales, June 2007–August 2009. Centers for Disease Control and Prevention, 2014.