Citazione APA

Ballard, M., & Mathias, P. (1971). Revolutions and steam engines 1775 - 1815. Methuen.

Stile di citazione Chicago

Ballard, Martin, e Peter Mathias. Revolutions and Steam Engines 1775 - 1815. London: Methuen, 1971.

Citazione MLA

Ballard, Martin, e Peter Mathias. Revolutions and Steam Engines 1775 - 1815. Methuen, 1971.