Παραπομπή APA

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

Παραπομπή Chicago Style

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

Παραπομπή MLA

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