1. Bliss , C.T. 1967 .“Statistics in Biology”Vol. 1 , 558 – 558 . New York : McGraw-Hill,
2. Bradley , J.V. 1968 .“Distribution Free Statistical Tests”, 388 – 388 . New York : Prentice-Hall .
3. Pesticides and the soil fauna
4. Preliminary investigations on the penetration and persistence of DDT under pasture