Encyclopaedia of environmental pollution and its control - G.R. Chhatwal; M.C. Mehra M. Satake T. Katyal (New Delhi Anmol Publications Pvt Limited, 1989)
G.R. Chhatwal; M.C. Mehra; M. Satake & T. Katyal: Encyclopaedia of environmental pollution and its control. New Delhi. Anmol Publications Pvt Limited, 1989. 81-7041-243-9 Rs. 6--(363.7303CHH)
ENGLISH