00306nam a2200109 a 450000500170000002000150001708200200003210000290005224500640008126000310014530000200017620251203092007.0  a8185484856  a300.72,bD, sri  aSrivastava, G.N. Prakash  aAdvanced research methodology, G.N. Prakash Srivastava, eng  aNew Delhi, Radha, Inc1994  axiv,300p.c20cm