Sepur standar

• Allen, Geoffrey Freeman (1987). Jane's World Railways, 1987–88. Jane's Information Group. ISBN 9780710608482. 
• Baxter, Bertran (1966). Stone Blocks and Iron Rails (Tramroads). Industrial Archaeology of the British Isles. Newton Abbot: David & Charles. 
• Jones, Robin (2013). The Rocket Men. Mortons Media Group. ISBN 9781909128279. 
• Jones, Stephen K. (2009). Brunel in South Wales. vol. II: Communications and Coal. Stroud: The History Press. hlm. 64–65. ISBN 9780752449128. 
• Setti, João Bosco (2008). Brazilian Railroads. Rio de Janeiro: Memória do Trem. ISBN 9788586094095 – via Google Books. 
• Vaughan, A. (1997). Railwaymen, Politics and Money. London: John Murray. ISBN 0-7195-5150-1. 
• Whishaw, Francis (1842). The Railways of Great Britain and Ireland: Practically Described and Illustrated. London: John Weale (republished 1969, David & Charles reprints: Newton Abbot). ISBN 0-7153-4786-1. 

• Pomeranz, Kenneth; Topik, Steven (1999). The World that Trade Created: Society, Culture, and World Economy, 1400 to the Present. Armonk, NY: M.E. Sharpe. ISBN 0-7656-0250-4. 
• Puffert, Douglas J. (2009). Tracks across Continents, Paths through History: The Economic Dynamics of Standardization in Railway Gauge. University of Chicago Press. ISBN 978-0-226-68509-0. 

Pranala luar

• "The Sydney Morning Herald". The Sydney Morning Herald. 23 May 1892. hlm. 4. Diakses tanggal 14 August 2011 – via National Library of Australia. , a discussion of gauge in Australia circa 1892
• A learned text of standardisation of gauge Diarsipkan 2009-02-02 di Wayback Machine.
• "Standard Railway Gauge". Townsville Bulletin. 5 October 1937. hlm. 12. Diakses tanggal 19 March 2014 – via National Library of Australia. , a discussion of the Roman gauge origin theory.