Usman, M., Kazmi, I., Khaliq, T., Ahmad, A., Saleem, M. F., & Shabbir, A. (2012) 'VARIABILITY IN WATER USE, CROP WATER PRODUCTIVITY AND PROFITABILITY OF RICE AND WHEAT IN RECHNA DOAB, PUNJAB, PAKISTAN', Journal of Animal and Plant Sciences, 22(4), pp. 998-1003.