Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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