1. Bogli, A., 1980, Karst Hydrology and Physical Speleology, Springer-Verlag, Berlin, 284 p.
2. Bretz, J H., 1942 Vadose and phteatic features of limestone caverns, J. Geol. 50:675-811
3. Brucker, R.W. and Burns, D.P., 1964, The Flint Ridge Cave System, Mammoth Cave National Park, Kentucky, Cave Research Foundation, Washington, DC, Folio, 3pp text plus 31 maps.
4. Bull, P.A. 1978, A study of stream gravels from a cave: Agen Allwedd, Powys, South Wales, Zeiss. Geornorph. 22:275-296.
5. Bull, P.A., 1981, Some fine-grained sedimentation phenomena in caves, British Geornorph. Res. Grp. J. 6:11-22.