Cita APA

Savage, N. P., & Savage, N. P. (1981). Railroad classification yard technology manual. Washington: Oficina of Research and Development Federal Railroad Transportation US, Departamento.

Citación estilo Chicago

Savage, Neal P., y Neal P. Savage. Railroad Classification Yard Technology Manual. Washington: Oficina of Research and Development Federal Railroad Transportation US, Departamento, 1981.

Cita MLA

Savage, Neal P., y Neal P. Savage. Railroad Classification Yard Technology Manual. Washington: Oficina of Research and Development Federal Railroad Transportation US, Departamento, 1981.