1. SNZ NZS 1170.5 Supp 1:2004, Structural Design Actions 2004
2. Determination of structural irregularity limits-mass irregularity example;Sadashiva;Bulletin of the New Zealand Society for Earthquake Engineering,2009
3. National Earthquake Hazards Reduction Program recommended provisions for seismic regulations for new buildings and other structures 2003
4. IBC International Building Code 2003
5. CEN EN 1998-1. Eurocode 8 2004