APA (7th ed.) Citation

Cowles, R. (1989). The making of the Severn Railway Tunnel. Alan Sutton.

Chicago Style (17th ed.) Citation

Cowles, Roger. The Making of the Severn Railway Tunnel. Gloucester, U.K.: Alan Sutton, 1989.

MLA (9th ed.) Citation

Cowles, Roger. The Making of the Severn Railway Tunnel. Alan Sutton, 1989.