1. Acharyya, S.K. and Basu, P.K. (1993) Toba Ash on the Indian Subcontinent and its implication for correlation on Late Pleistocene alluvium. Quaternary Res., v.40, pp.10–19.
2. Aftabuzzaman, M. (2011) Characteristics of Red Soil Horizon in Bangladesh: Unpubld. M.Sc. thesis, University of Rajshahi, Rajshahi, Bangladesh, 114p.
3. Alam, Akmk, Coates, Da, Mannan, Kh, Ahmed, D. and Hossain, S. (2008) Geology of Parts of Tangail and Mymensingh districts. Geol. Surv. Bangladesh, v.11, p.5.
4. Alam, M.K., Hossain, A.K.M.S., Khan, M.R. and Whitney, J.W., (1990) Geological map of Bangladesh. Geol. Surv. Bangladesh, Dhaka, (Scale 1.1, 000,000).
5. Alam, M.S. and Paepe, R. (1996) Palaeosol in the Quaternary Stratigraphy in Northwestern Bangladesh: Bangladesh Geoscience Jour., v.2, pp.15–36.