GOPAL M. (2007). CONTROL SYSTEMS: PRINCIPLES AND DESIGN (2ND ED.). TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED.
Lua i Stíl Chicago (17ú heag.)GOPAL M. CONTROL SYSTEMS: PRINCIPLES AND DESIGN. 2ND ED. NEW DELHI: TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2007.
Lua MLA (9ú heag.)GOPAL M. CONTROL SYSTEMS: PRINCIPLES AND DESIGN. 2ND ED. TATA MCGRAW-HILL PUBLISHING COMPANY LIMITED, 2007.
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