APA (7th ed.) Citation

Bolza, O. (1946). Lectures on the calculus of variations. G. E. Stechert.

Chicago Style (17th ed.) Citation

Bolza, O. Lectures on the Calculus of Variations. New York: G. E. Stechert, 1946.

MLA (9th ed.) Citation

Bolza, O. Lectures on the Calculus of Variations. G. E. Stechert, 1946.