APA (7th ed.) Citation

Seelig, C., & Pérez Torres, M. L. (1968). Albert-Einstein. Espasa-Calpe.

Chicago Style (17th ed.) Citation

Seelig, Carl, and María Luisa Pérez Torres. Albert-Einstein. Madrid: Espasa-Calpe, 1968.

MLA (9th ed.) Citation

Seelig, Carl, and María Luisa Pérez Torres. Albert-Einstein. Espasa-Calpe, 1968.

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