1. Newton I., Phil Trans. No. 80, 3075-3087 (Feb. 19, 1671/72)
2. facsimile reproduction in Isaac Newton's Papers and Letters on Natural Philosophy, 2nd ed., Cohen I. B., Ed. (Harvard University Press, Cambridge, MA, 1978), pp. 47-59.
3. Ruled gratings and wavelength tables
4. Taylor L. W., Physics, the Pioneer Science (Houghton Mifflin, New York, 1941) pp. 532, 536.
5. Asimov I., Asimov's Biographical Encyclopedia of Science and Technology (Doubleday, Garden City, NY, 1972), pp. 136, 525.