एपीए उद्धरण

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

शिकागो स्टाइल उद्धरण

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

एमएलए उद्धरण

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