APA (7th ed.) Citation

Forray, M. J. (1968). Variational calculus in science and engineering. McGraw-Hill.

Chicago Style (17th ed.) Citation

Forray, Marvin J. Variational Calculus in Science and Engineering. New York: McGraw-Hill, 1968.

MLA (9th ed.) Citation

Forray, Marvin J. Variational Calculus in Science and Engineering. McGraw-Hill, 1968.