Cita APA (7th ed.)
Petruzella, F. D. (1998). Programmable logic controllers (2nd ed.). Glencoe/McGraw-Hill.
Cita Chicago (17th ed.)
Petruzella, Frank D. Programmable Logic Controllers. 2nd ed. New York: Glencoe/McGraw-Hill, 1998.
Cita MLA (9th ed.)
Petruzella, Frank D. Programmable Logic Controllers. 2nd ed. Glencoe/McGraw-Hill, 1998.
Atenció: Aquestes cites poden no estar 100% correctes.