1. Bally, E.C.C.: Spectroscopy, 3rd edn., vol. I. Longmans, Green & Co., Harlow (1924)
2. Clarke, F.W.: Biographical Memoir of William Francis Hillebrand, pp. 54–63. National Academy of Sciences, Washington, DC (1928)
3. Draper, J.W.: Science in America. In: Draper, J.W. (ed.), John F. Trow & Son, New York (1876)
4. Harrow, B., Ramsay, W.M.: The scientific monthly, 9(2), pp. 167–178 (1919)
5. Herschel, J.: Account of the solar eclipse of 1868, as seen at Jamkandi in Bombay Presidency. Proc. Roy. Soc. Lond. 17, 104–125 (1868)