Cita APA (7a ed.)

Ogburn, C., & Sugar, J. A. (1977). Railroads, the great American adventure. The National Geographic Society.

Cita Chicago Style (17a ed.)

Ogburn, Charlton, y James A. Sugar. Railroads, the Great American Adventure. Washington: The National Geographic Society, 1977.

Cita MLA (9a ed.)

Ogburn, Charlton, y James A. Sugar. Railroads, the Great American Adventure. The National Geographic Society, 1977.