APA (7th ed.) Citation

Gel'fand, I. M., Fomin, S. V., & Silverman, R. A. (2000). Calculus of variations. Dover Publications.

Chicago Style (17th ed.) Citation

Gel'fand, I. M., S. V. Fomin, and Richard A. Silverman. Calculus of Variations. Mineola, N.Y.: Dover Publications, 2000.

MLA (9th ed.) Citation

Gel'fand, I. M., et al. Calculus of Variations. Dover Publications, 2000.