Ansari, K.K. and S. Prakash (2000) : Limnological studies on Tulsidas Tal of Tarai Region of Balrampur in relation to fisheries. Poll. Res. Vol. 19 (4): 651-655 pp.
APHA, (1975) : Standard methods for the examination of water and waste water, 14 th Ed. APHA AWWA WPCF, Washington- DC. 20036.