Ansari, S. M. Razaullah (1975). "On Indian observatories in the 19th century". Proceedings of the Indian History Congress. 36: 523–530. ISSN2249-1937. JSTOR44138874.
Ansari, S. M. Razaullah (1975). "On Indian observatories in the 19th century". Proceedings of the Indian History Congress. 36: 523–530. ISSN2249-1937. JSTOR44138874.