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APA Citation
Tudor-Williams, G., Frankland, J., Isaacs, D., Mayon-White, R. T., MacFarlane, J. A., Rees, D. G., & Moxon, E. R. (1989). haemophilus influenzae type b conjugate vaccine trial in Oxford: implications for the United Kingdom.. Archives of disease in childhood, 64(4), 520–524. http://access.bl.uk/ark:/81055/vdc_100136715236.0x000055