Hunt, J B; Christmas, P (1995) Index of NPL radiation science publications 1985-1994. NPL Report. RSA(EXT)59
Christmas, P (1994) Recommendations for the presentation of type-test data for radiation protection instruments used in hospitals. Technical Report.
Burgess, P H*; Belton, I*; Christmas, P; Rawlings, D*; Walker, A* (1996) An IPSM sponsored intercomparison of dose rate monitoring instrument test results. J. Radiol. Prot., 15. pp. 235-244.