1. V. D. Naik and P. C. Gupta, ‘‘A note on estimation of mean with known population proportion of an auxiliary character,’’ J. Indian Soc. Agricult. Stat. 48, 151–158 (1996).
2. H. S. Jhajj, M. K. Sharma, and L. K. Grover, ‘‘A family of estimators of population mean using information on auxiliary attribute,’’ Pakist. J. Stat. 22, 43–50 (2006).
3. J. Shabbir and S. Gupta, ‘‘On estimating the finite population mean with known population proportion of an auxiliary variable,’’ Pakist. J. Stat. 23, 1–9 (2007).
4. R. Singh, P. Cauhan, N. Sawan, and F. Smarandache, Auxiliary Information and A Priori Values in Construction of Improved Estimators (Renaissance High Press, Infinite Study, USA, 2007).
5. R. Singh, P. Cauhan, N. Sawan, and F. Smarandache, ‘‘Ratio estimators in simple random sampling using information on auxiliary attribute,’’ Pakist. J. Stat. Oper. Res. 4, 47–53 (2008).