APA (7th ed.) Citation

Kimball, W. S. (1952). Calculus of variations: By parallel displacement. Butterworths Scientific Publ.

Chicago Style (17th ed.) Citation

Kimball, William S. Calculus of Variations: By Parallel Displacement. London: Butterworths Scientific Publ, 1952.

MLA (9th ed.) Citation

Kimball, William S. Calculus of Variations: By Parallel Displacement. Butterworths Scientific Publ, 1952.

Warning: These citations may not always be 100% accurate.