Webb, J. W., & Reis, R. A. (1995). Programmable logic controllers: Principles and applications (3rd ed.). Prentice Hall Simon & Schuster Asia.
Lua i Stíl Chicago (17ú heag.)Webb, John W., agus Ronald A. Reis. Programmable Logic Controllers: Principles and Applications. 3rd ed. Singapore: Prentice Hall Simon & Schuster Asia, 1995.
Lua MLA (9ú heag.)Webb, John W., agus Ronald A. Reis. Programmable Logic Controllers: Principles and Applications. 3rd ed. Prentice Hall Simon & Schuster Asia, 1995.
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