"ICE Virtual Library". Minutes of the Proceedings of the Institution of Civil Engineers. 55 (1879). ICE Virtual Library: 319–320. January 1879. doi:10.1680/imotp.1879.22398. Retrieved 24 January 2016.
"ICE Virtual Library". Minutes of the Proceedings of the Institution of Civil Engineers. 55 (1879). ICE Virtual Library: 319–320. January 1879. doi:10.1680/imotp.1879.22398. Retrieved 24 January 2016.