1. India Meteorological Department (IMD) (1962a) Monthly and annual rainfall and number of rainy days based on records from 1901–1950. Memoirs IMD, vol XXXI, pt. III
2. India Meteorological Department (IMD) (1962b) Monthly and annual rainfall and number of rainy days, period 1901–1950, part IV B. Govt. of India, Pune, Printed by Govt of India Press, Nasik
3. India Meteorological Department (IMD) (1985) Climatological tables of observation from India (1931–61). Govt. of India, Pune
4. Sarkar RDG (1981) A study in trends and periodicities of rainfall over Brahmaputra catchment. Basin hydrology. Monograph no. 9. IMD, Govt. of India, Pune
5. Research monograph;S Singh,2007