1. American Meteorological Society, 1997. Meteorological drought: policy statement. Bulletin of the American Meteorological Society, vol. 78, pp. 847–849.
2. American Meteorological Society, 2004. Statement on meteorological drought. Bulletin of the American Meteorological Society, vol. 85, pp. 771–773.
3. Attri, S.D., Tyagi, A., 2010. Climate profile of India. Contribution to the Indian Network of Climate Change Assessment (National Communication-II), Ministry of Environment and Forests. India Meteorological Department.
4. Features and interdecadal variability of droughts in the homogeneous rainfall zones over the East Asian monsoon region;Awan;Int. J. Climatol.,2015