Sage, A. P. (1977). Optimum systems control (2nd ed.). Prentice-Hall of India.
Dyfyniad Arddull ChicagoSage, Andrew P. Optimum Systems Control. 2nd ed. New Jersey: Prentice-Hall of India, 1977.
Dyfyniad MLASage, Andrew P. Optimum Systems Control. 2nd ed. Prentice-Hall of India, 1977.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.