1. Depression (NIH Publication No. 15-3561), U.S. Dept. Health Hum. Services, Nat. Inst. Health, U.S. Government Printing Office, Bethesda, MD, USA (2015)
2. World Health Organization. Depression (2019). http://www.who.int/en/news-room/fact-sheets/detail/depression
3. Bear M.F., Connors B.W., Paradiso M.A.: Neuroscience: Exploring the Brain. Lippincot, Williams and Wilkins, Philadelphia, PA, USA (2007)
4. Malik, J., Dahiya, M., Kumari, N.: Brain wave frequency measurement in gamma wave range for accurate and early detection of depression. Int. J. Adv. Res. Innov. 6(1), 21–24 (2018)
5. Sayers, J.: The world health report 2001-Mental health: new understanding, new hope. Bull. World Health Org. 79(11), 1085 (2001)