Snell, J. J., Demello, J. V., Gardner, P. S., Kwantes, W., & Brooks, R. (1984). Detection of toxin production by Corynebacterium diphtheriae: Results of a trial organised as part of the United Kingdom National External Microbiological Quality Assessment Scheme.

Snell, J J., J V. Demello, P S. Gardner, W. Kwantes, a R. Brooks. Detection of Toxin Production By Corynebacterium Diphtheriae: Results of a Trial Organised As Part of the United Kingdom National External Microbiological Quality Assessment Scheme. 1984.

Snell, J J., et al. Detection of Toxin Production By Corynebacterium Diphtheriae: Results of a Trial Organised As Part of the United Kingdom National External Microbiological Quality Assessment Scheme. 1984.