APA-referens (7:e uppl.)
Gopal, M. (2009). Digital control and state variable methods: Conventional and intelligent control systems (3rd ed.). Tata McGraw-Hill.
Chicago-referens (17:e uppl.)
Gopal, M. Digital Control and State Variable Methods: Conventional and Intelligent Control Systems. 3rd ed. New Delhi: Tata McGraw-Hill, 2009.
MLA-referens (9:e uppl.)
Gopal, M. Digital Control and State Variable Methods: Conventional and Intelligent Control Systems. 3rd ed. Tata McGraw-Hill, 2009.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.