1. Japan Society of Civil Engineers (2010) Guidelines for Design of Wind Turbine Support Structures and Foundations. Tokyo, Japan: Maruzen, pp.1–454.
2. Kinki Construction Engineering Office, Kinki Regional Development Bureau, Ministry of Infrastructure, Land, Transportation and Tourism of Japan (1996) Testing Method with Simple Instrument for Measuring Bearing Capacity of soil Ground. Hirakata, Osaka, Japan: Kinki Construction Engineering Office, pp.1–13.