Freestone, D. S., Bowker, C. H., Letley, E., Ferris, R. D., White, W. G., & Barnes, G. M. (1976). A clinical trial of WRL 105 strain live attenuated influenza vaccine comparing four methods of intranasal vaccination. Cambridge University Press.

Freestone, D. S., C. H. Bowker, E. Letley, R. D. Ferris, W. G. White, and G. M. Barnes. A Clinical Trial of WRL 105 Strain Live Attenuated Influenza Vaccine Comparing Four Methods of Intranasal Vaccination. Cambridge University Press, 1976.

Freestone, D. S., et al. A Clinical Trial of WRL 105 Strain Live Attenuated Influenza Vaccine Comparing Four Methods of Intranasal Vaccination. Cambridge University Press, 1976.