NISE, Norman S. Control systems engineering. 6th ed. Hoboken, NJ: Wiley, c2011. ISBN 978-0470547564 .
ARAKI, M. Automation in mining, mineral, and metal processing 2001 (MMM2001): a proceedings volume from the 10th IFAC symposium, Tokyo, Japan, 4-6 September 2001. New York: Published for the International Federation of Automatic Control by Pergamon, 2001. ISBN 0080436927
KUO, Benjamin C. Automatic Control Systems. 6. ed. New Yersey: Prentice-Hall, 1991