Hodder, S. B., R. I. Skinner, R. T. Hefford, and P. M. Randal. 1978. “Strong Motion Records of the Milford Sound Earthquake 1976 May 4”. Bulletin of the New Zealand Society for Earthquake Engineering 11 (3): 184-90. https://doi.org/10.5459/bnzsee.11.3.184-190.