1. Adams, W.S., 1939. Biographical Memoir of George Ellery Hale, 1869–1938. Biographical Memoirs of the National Academy of Sciences of the United States of America, 21, 181–241.
2. Ansari, S.M.R., 1977. On the early development of Western astronomy in India and the role of Royal Greenwich Observatory. Archives Internationales d’Histoire des Sciences, 27, 237–252.
3. Ansari, S.M.R., 1985. Introduction of modern astronomy in India during 18th-19th centuries, with a foreword by Hakeem Abdul Hameed. New Delhi, IHMMR (present Hamdard University) Hamdard Nagar, 81pp. Cf. also Indian Journal of History of Science, 20, 363–402 (1985), but especially pp. 390–394. But here I refer to pages and notes of the former monograph.
4. Ansari, S.N.R., 2000. Introduction of modern Western astronomy in India during 18th–19th centuries. In Sen, S.N., and Shukla, K.S. (eds.). History of Astronomy in India. New Delhi, Indian National Science Academy. Pp. 395–453.
5. Ansari, S.M.R., 2011. Early modern observatories in India, 1792–1900. In Das Gupta, U. (ed.). History of Science, Philosophy and Culture in Indian Civilization. Volume XV, Part 4. Science and Modern India: An Institutional History, c.1784–1947. Delhi, Pearson Longman. Pp. 349–379.