1. Paula Yurkanis Bruice, organic chemistry, 7th ed., California/ USA, 2014.
2. S. H. Ahmed and A. Chattree, Transition Metal Catalyzed Synthesis of Biologically Active Heterocycles, European Academic Research, Vol. 3, pp. 2286–4822, 2015.
3. J. A. Joule and K. Mills, Heterocyclic chemistry at a glance, John Wiley & Sons, USA, pp. 354–357, 2012.
4. D. R. Kerzarea and P. B. Khedekar, Indole derivatives acting on central nervous system–review, J. Pharm Sci Bioscientific, 2016.
5. G. Murtaza, A. Mumtaz, F. Khan, S. Ahmad, S. Azhar, M. Najam- Ul-Haq and I. Hussain, Recent pharmacological advancements in schiff bases: A review, Acta Pol. Pharm, Vol. 71, no. 4, pp. 531–535, 2014.