APA-viite (7. p.)
Gopal, M. (2009). Digital control and state variable methods: Conventional and intelligent control systems (3rd ed.). Tata McGraw-Hill.
Chicago-viite (17. p.)
Gopal, M. Digital Control and State Variable Methods: Conventional and Intelligent Control Systems. 3rd ed. New Delhi: Tata McGraw-Hill, 2009.
MLA-viite (9. p.)
Gopal, M. Digital Control and State Variable Methods: Conventional and Intelligent Control Systems. 3rd ed. Tata McGraw-Hill, 2009.
Varoitus: Nämä viitteet eivät aina ole täysin luotettavia.