1. [1] Cochran, W. G., “Sampling Techniques”, 3rd edition, India: Wiley Eastern Limited, (1940).
2. [2] Murthy, M. N., “Sampling Theory and Methods”, India: Statistical Publishing Society, (1967).
3. [3] Sisodia, B. V., Dwivedi, V. K., “A modified ratio estimator using coefficient of variation of auxiliary variable”, Journal Indian Society of Agricultural Statistics, 8(1): 20-25, (1981).
4. [4] Upadhyaya, L. N., Singh, H. P., “Use of transformed auxiliary variable in estimating the finite population mean”, Biometrical Journal, 41(5): 627-636, (1999).
5. [5] Singh, G. N., “On the improvement of product method of estimation in sample surveys”, Journal of the Indian Society of Agricultural Statistics, 56(3): 267-275, (2003).