Lewis, R. W. (1998). Programming industrial control systems using IEC 1131-3 (Rev. ed.). The Institution of Electrical Engineers.
Chicago-referens (17:e uppl.)Lewis, Robert W. Programming Industrial Control Systems Using IEC 1131-3. Rev. ed. London: The Institution of Electrical Engineers, 1998.
MLA-referens (8:e uppl.)Lewis, Robert W. Programming Industrial Control Systems Using IEC 1131-3. Rev. ed. The Institution of Electrical Engineers, 1998.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.