References
Books
1. Biswanath, Paul. Industrial Electronics and Control. City: Prentice-Hall of India Pvt.Ltd, 2004.
2. Khan, Anwar. And Kanchan K Dey}. A First Course in Electronics. City: Prentice-Hall of India Pvt.Ltd, 2006.
3. Author. Pulse Digital & Switching Waveforms. Boston: McGraw Hill Higher Education.
Webliography
1. http://en.wikipedia.org/wiki/Multivibrator
2. http://www.falstad.com/circuit/e-multivib-a.html
3. http://www.davidbridgen.com/astable.htm
4. http://www.scribd.com/doc/12862517/Designing-an-Astable-Multivibrator