1. Standards New Zealand. NZS 4298: 1998 Materials and workmanship for earth buildings – incorporating amendment no. 1. Standards New Zealand, Wellington, New Zealand, 1998
2. Earth construction – a comprehensive guide;Houben,1996
3. Frederick C. (University of Sheffield) Pers. comm
4. Henman D. Pers. comm., visited Horyuji temple site 2002-Official website http://www.horyuji.or.jp
5. The rammed earth house;Easton,1996