Bolton, W. (2009). Programmable logic controllers (5th ed.). Newnes.
Chicago Style (17th ed.) ZitazioaBolton, W. Programmable Logic Controllers. 5th ed. Oxford: Newnes, 2009.
MLA (9th ed.) ZitazioaBolton, W. Programmable Logic Controllers. 5th ed. Newnes, 2009.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.