Nagrath, I. J., & Gopal, M. (1981). Control systems engineering (2a. ed.). Wiley Eastern.
Lua i Stíl Chicago (17ú heag.)Nagrath, I. J., agus M. Gopal. Control Systems Engineering. 2a. ed. Nueva Delhi: Wiley Eastern, 1981.
Lua MLA (9ú heag.)Nagrath, I. J., agus M. Gopal. Control Systems Engineering. 2a. ed. Wiley Eastern, 1981.
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