Berrie AD (1992). "The chalk-stream environment". Hydrobiologia. 248: 3–9. doi:10.1007/BF00008881.
West G, Dumbleton MJ (1972). "Some observations on swallow holes and mines in the chalk". Quarterly Journal of Engineering Geology. 5 (1–2): 171–177. doi:10.1144/GSL.QJEG.1972.005.01.16. S2CID129120488.
"Rivers". Norfolk Rivers Trust. Archived from the original on 12 June 2018. Retrieved 7 June 2018.
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West G, Dumbleton MJ (1972). "Some observations on swallow holes and mines in the chalk". Quarterly Journal of Engineering Geology. 5 (1–2): 171–177. doi:10.1144/GSL.QJEG.1972.005.01.16. S2CID129120488.