APA (7th ed.) Citation

Postinikov, M. M., & Gelbaum, B. R. (1967). The variational theory of geodesics. Saunders.

Chicago Style (17th ed.) Citation

Postinikov, Mikhail Mikhailovich, and Bernard R. Gelbaum. The Variational Theory of Geodesics. Philadelphia: Saunders, 1967.

MLA (9th ed.) Citation

Postinikov, Mikhail Mikhailovich, and Bernard R. Gelbaum. The Variational Theory of Geodesics. Saunders, 1967.