Gaya APA

Phillips, C, L., Harbor, R, D. (1991). Feedback control systems (2nd ed). Englewood Cliffs, NJ: Prentice Hall.

Gaya MLA

Phillips, Charles, L.., Harbor, Royce, D.. "Feedback control systems". 2nd ed Englewood Cliffs, NJ: Prentice Hall, 1991. Text.