Cita APA (7a ed.)

Ridley, J. E. (1997). Introduction to programmable logic controllers. Arnold.

Cita Chicago Style (17a ed.)

Ridley, John E. Introduction to Programmable Logic Controllers. London [etc.]: Arnold, 1997.

Cita MLA (9a ed.)

Ridley, John E. Introduction to Programmable Logic Controllers. Arnold, 1997.