APA (7th ed.) Zitazioa

Postnikov, M. M. (1967). The variational theory of geodesics. W. B. Saunders.

Chicago Style (17th ed.) Zitazioa

Postnikov, M. M. The Variational Theory of Geodesics. Filadelfia: W. B. Saunders, 1967.

MLA (9th ed.) Zitazioa

Postnikov, M. M. The Variational Theory of Geodesics. W. B. Saunders, 1967.