1. S. Ramanujan, Collected Papers, Chelsea, New York, 1962, 351–
2. Ramanujan’s Notebooks
3. Two Results of Ramanujan
4. E. T. Whittaker, G. N. Watson, A Course of Modern Analysis, Cambridge University Press, Cambridge, UK, 1966, 521–0951.30002
5. B. C. Berndt, Ramanujan's Notebooks, Part II, Entry 35(iv), Springer-Verlag, New York, 1988, 45–