J. Stewart Ullyot, Nash D.J., Whiteman C.A. & Mortimore R.N.: Distribution, petrology and mode of development of silcretes (sarsens and puddingstones) on the eastern South Downs, UK. In: Earth Surface Processes and Landforms. 29. Jahrgang, Nr.12, 2004, doi:10.1002/esp.1136, bibcode:2004ESPL...29.1509U.
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J. Stewart Ullyot, Nash D.J., Whiteman C.A. & Mortimore R.N.: Distribution, petrology and mode of development of silcretes (sarsens and puddingstones) on the eastern South Downs, UK. In: Earth Surface Processes and Landforms. 29. Jahrgang, Nr.12, 2004, doi:10.1002/esp.1136, bibcode:2004ESPL...29.1509U.