APA Style

Webb, J, W., REIS, R, A. (1999). Programmable Logic Controllers; Principles and Applications. Fourth Edition . Tanpa Kota: Prentice Hall.

MLA Style

Webb, John, W.., REIS, RONALD, A.. "Programmable Logic Controllers; Principles and Applications. Fourth Edition". Tanpa Kota: Prentice Hall, 1999. Text.