Cita APA (7a ed.)

Hermann,Robert. (1968). Differential geometry and the calculus of variations. Academic Press.

Cita Chicago Style (17a ed.)

Hermann,Robert. Differential Geometry and the Calculus of Variations. New York: Academic Press, 1968.

Cita MLA (9a ed.)

Hermann,Robert. Differential Geometry and the Calculus of Variations. Academic Press, 1968.