Cita APA (7th ed.)

Fox, C. (1954). An introduction to the calculus of variations. Oxford University Press.

Cita Chicago (17th ed.)

Fox, Charles. An Introduction to the Calculus of Variations. Londres: Oxford University Press, 1954.

Cita MLA (9th ed.)

Fox, Charles. An Introduction to the Calculus of Variations. Oxford University Press, 1954.