Cita APA (7a ed.)

O'Brien, P. K. (1977). The new economic history of the railways. Croom Helm.

Cita Chicago Style (17a ed.)

O'Brien, Patrick Karl. The New Economic History of the Railways. London: Croom Helm, 1977.

Cita MLA (9a ed.)

O'Brien, Patrick Karl. The New Economic History of the Railways. Croom Helm, 1977.