text: * Ganguli, S. (2002). [http://www.ias.ac.in/currsci/jun102002/1303.pdf Neem: A therapeutic for all seasons]. Current Science. 82(11), June. p. 1304
  * Siddiqui, S. and Siddiqui, R.H. (1931). Chemical examination of the roots of Rauwolfia serpintina. Journal of the Indian Chemical Society. 8. pp. 667–80.
  * Siddiqui, S. and Siddiqui, R.H. (1932). The alkaloids of Rauwolfia serpintina. Part I. Ajmaline series. Journal of the Indian Chemical Society. 9. p. 539.
  * Siddiqui, S. and Siddiqui, R.H. (1935). The alkaloids of Rauwolfia serpintina. Part II. Ajmaline series. Journal of the Indian Chemical Society. 12. p. 37.
  * Siddiqui, S. (1942). A note on isolation of three new bitter principles from the neem oil. Current Science. 11. pp. 278–79.