• Tillé, Y. Sampling Alogrithms. Springer series in statistics. Springer science + Business media, Inc., New York, 2006.
• Rao, P.S.R.S.. On applying the Jack-Knife procedure to the ratio estimator, md. Jour. Stat., (1979), 41, C, 115-126.
• Sahoo, L.N. & Swain, A.K.P.C. On two modified ratio estimators in two phase sampling, Metron, (1989), 47, 1-4, 261-266.
• Pandey, B.N. and Dubey Vyas. On almost unbiased estimators, Metron, (1989), 47, 1-4, 333-338.
• Singh, Randhir and Narain, P. Method of estimation from samples with random sample size, J. Stat. Plann. Inference, (1989), 23, 2, 217-225.
• Naik, V.D. & Gupta, P.C. A general class of estimators for population mean using auxiliary information, Metrika, (1991), 38, 1, 11-17.
• Chaudhuri, A. and Adhikari, A.K. On the efficiency of ratio estimator, Metriká, (1989), 36, 1, 55-59.
• Tripathi, T.P. Contributions to the sampling theory using multivariate information, Ph.D. thesis submitted to Punjabi University, Patiala, India (1970).
• Bansal, M.L. and Singh, R. An alternative estimator for multiple characteristics in PPS sampling, J. Stat. Plann. And Inf., (1985), 11, 313-320.
• Gupta, V.K. A method of inclusion probability proportional tosize selection Statistica, (1990), 49, 2, 277-28 1.
• Singh, H.P. et. al. Modified exponential ratio and product estimators for finite population mean in double sampling. Austrian journal of Statistics, 2007, 36, 3, 2 17-225.