Alam, A. K. M. Masud; Xie, Shucheng; Saha, Dilip Kumar; Chowdhury, Sifatul Quader (2007). "Clay mineralogy of archaeological soil: an approach to paleoclimatic and environmental reconstruction of the archaeological sites of the Paharpur area, Badalgacchi upazila, Naogaon district, Bangladesh". Environmental Geology. 53 (8). Springer: 1639–1650. doi:10.1007/s00254-007-0771-1. S2CID129426067.
Alam, A. K. M. Masud; Xie, Shucheng; Saha, Dilip Kumar; Chowdhury, Sifatul Quader (2007). "Clay mineralogy of archaeological soil: an approach to paleoclimatic and environmental reconstruction of the archaeological sites of the Paharpur area, Badalgacchi upazila, Naogaon district, Bangladesh". Environmental Geology. 53 (8). Springer: 1639–1650. doi:10.1007/s00254-007-0771-1. S2CID129426067.