1. Feasibility of mixing Fly ash in Manufacture of burnt clay bricks Report by Aligarh Muslim University
2. http://en.wikipedia.org/wiki/Coal#Major_coal_producers)
3. https://www.jmaterenvironsci.com/Document/vol9/vol9_N2/42-JMES-3610-Gorai.pdf
4. https://www.ijert.org/experimental-investigation-on-performance-of-fly-ash-and-quarry-dust-in-a-concrete
5. Priya, A.K., Nithya, M., Rajeswari, M., Priyanka, P.M., Vanitha, R., 2016. Experimental Investigation on Developing Low Cost Concrete by Partial Replacement of Waste Sludge, International Journal of ChemTech Research CODEN (USA): IJCRGG Vol.9, No.01 pp. 240–247.