APA (7th ed.) Citation

Simpson, C. D. (1994). Programmable logic controllers. Regents-Prentice-Hall.

Chicago Style (17th ed.) Citation

Simpson, Colin D. Programmable Logic Controllers. Englewood Cliffs, New Jersey: Regents-Prentice-Hall, 1994.

MLA (9th ed.) Citation

Simpson, Colin D. Programmable Logic Controllers. Regents-Prentice-Hall, 1994.