1. htps://www.amazon.in Scientech-WideScreen-Digital-Oscilloscope
2. http://www.hparchive.com/
3. Electronics & Power November/December 1980
4. http://www.chiark.greenend.org.uk/scopes/tek.html
5. https://circuitglobe.com/wp-content/uploads/2017/06/block-diagram-of-oscilloscope.jpg