Usman, M., I. Kazmi, T. Khaliq, A. Ahmad, M. F. Saleem, and A. Shabbir. 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): 998-1003.