Williams, D. “Seismic Resistance of Brick Masonry Walls: Bulletin of the N.Z.N.S.E.E., Vol. 7, No. 4, December, 1974”. Bulletin of the New Zealand Society for Earthquake Engineering, vol. 8, no. 3, Sept. 1975, pp. 238-40, doi:10.5459/bnzsee.8.3.238-240.