APA (7th ed.) Citation

Petrov, I. P. (1968). Variational methods in optimum control theory. Academic Press.

Chicago Style (17th ed.) Citation

Petrov, I͡U. P. Variational Methods in Optimum Control Theory. New York: Academic Press, 1968.

MLA (9th ed.) Citation

Petrov, I͡U. P. Variational Methods in Optimum Control Theory. Academic Press, 1968.