References
[1]. Cochran, W. G. (2007). Sampling techniques. John Wiley & Sons.
[2]. Hansen, M. H., Hurwitz, W. N., & Madow, W. G. (1953). Sample survey methods and theory. V. 1. Methods and applications. V. 2. Theory (No. 519.52 H249). Wiley.
[3]. Kish, L. (1965). Survey sampling (No. 04; HN29, K5.).
[4]. Levy, P. S., & Lemeshow, S. (2013). Sampling of populations: methods and applications. John Wiley & Sons.
[5]. Thompson, S. K., Wilks, S., & Shewhart, W. (2012). Stratified sampling. SK Thompson, Sampling, 139-156.
[6]. University of Delhi, 91st annual report 2013-14
[7]. http://du.ac.in/du/index.php?mact=News,cntnt01,detail,0&cntnt01articleid=5471&cntnt01returnid=83