1.	Kumar, Sanjay (2018)	'Status of • Health and Hygiene in 
Darbhanga District: A Study in Social and Community Life, Ph. D. Thesis (Unpublished), L.N. Mithila University, Darbhanga
2.	Curtis, V. and Kanki, B. (1998): 'Happy, Healthy & Hygienic' American Public        Health Association, Washington, U.S.A.
3.	Boot M.S. Cairns (ed.) (1993): Actions Speak: The study of Hygiene Behaviors in Water & Sanitation, Projects, The Hague, IRC 
4.	Esrey, S. (1996): 'Water waste and Well-being: A Multi. Country Study,'                          American Journal of Epidemiology 143 (6): 608-623
5.	  Huffy S. (2002) 'The Impact of Inadequate Sanitary Conditions on Health in   Developed countries, London School of Hygiene and Tropical Medicine, London.