1. K Ogata, Discrete-Time Control Systems, University of Minnesota, Prentice Hall, 1987.
2. N Adhikari, M Choubey and R Singh, DC motor control using Ziegler-Nichols and genetic algorithm technique, International Journal of Electrical, Electronics and Computer Engineering, April 2012.
3. Abdulameer M Sulaiman, MSM Aras and D Saleem, Tuning methods of PID controller for DC motor speed control, Indonesia Journal of Electrical Engineering and Computer Science, Vol.3 No.2, Aug 2016.
4. MATLAB help document “DC motor control” https://in.mathworks.com/help/control/examples/dc-motor-control.html