National Geophysical Research Institute (India). (1977). Observatories' data of the National Geophysical Research Institute, Hyderabad. National Geophysical Research Institute].
Chicago-referens (17:e uppl.)National Geophysical Research Institute (India). Observatories' Data of the National Geophysical Research Institute, Hyderabad. [Hyderabad, India: National Geophysical Research Institute], 1977.
MLA-referens (8:e uppl.)National Geophysical Research Institute (India). Observatories' Data of the National Geophysical Research Institute, Hyderabad. National Geophysical Research Institute], 1977.
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