1. Robert N. Bateson, “Introduction to Control System Technology”, Prentice Hall, 2002. 
2. J. Love, “Process Automation Handbook”, Springer, 2007.
3. J. A. Rehg, G. J. Sartori, “Programmable Logic Controllers”, Prentice Hall, 2007.
4. Tariq Samad, “Perspectives in Control Engineering”, IEEE PRESS, 2001.
5. “Control in an Information Rich World”, Report of the Panel on Future Directions in Control,
    Dynamics, and Systems, June 2002.
6. C.T. Jones, “Step 7 in 7 Steps (A Practical Guide to Implementing S7-300/S7-400
    Programmable Logic Controllers)”, C.T. Jones, 2006. ISBN 1-889101-03-6.
7. Hans Berger, “Automating with STEP7 in STL and SCL (SIMATIC S7-300/400 Programmable
    Controllers)”, 4th revised edition, Publicis Corporate Publishing, 2007,
    ISBN 978-3-89578-295-4.