1. American Public Health Association. 1971. Standard methods for the examination of water and wastewater 13th ed. American Public Health Association Inc. New York.
2. Bordner R. H. and B. J. Carroll. 1972. Proceedings of seminar on the significance of fecal coliform in industrial wastes. U.S. Environmental Protection Agency Denver Colo.
3. Buchanan R. E. and N. E. Gibbons. 1974. Bergey's manual of determinative bacteriology 8th ed. The Williams & Wilkins Co. Baltimore.
4. Conn H. J. 1961. Biological stains. The Williams & Wilkins Co. Baltimore.
5. Klebsiella biotypes among coliforms isolated from forest environments and farm produce;Duncan D. W.;Appl. Microbiol.,1972