एपीए उद्धरण

Friedman, M. D. (1968). Variational methods in optimum control theory. Academic Press.

शिकागो स्टाइल उद्धरण

Friedman, M D. Variational Methods in Optimum Control Theory. New York: Academic Press, 1968.

एमएलए उद्धरण

Friedman, M D. Variational Methods in Optimum Control Theory. Academic Press, 1968.