1. Standard Methods for the Examination of Water and Wastewater;APHA,1985
2. Ossein wastewater characterization and treatability study;Badrinath;Water Res.,1991
3. Nitrogen assimilation in marine environment;Herbert,1977
4. Water pollution control in the fertilizer manufacturing industry;Kiff,1987
5. Ecological Methods for Field and Laboratory Investigations;Michael,1984