"Provisional Convention... concerning the junction of the Japanese and Russian Railways in Manchuria" - June 13, 1907. Endowment for International Peace (2009). Manchuria: Treaties and Agreements. BiblioBazaar, LLC. p. 108. ISBN1-113-11167-4.
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Haywood, R. M. (March 1969). «The Question of a Standard Gauge for Russian Railways, 1836-1860». Slavic Review28 (1): 72-80. doi:10.2307/2493039.
«Ratatekniset määräykset ja ohjeet». Finnish Rail Administration. Consultado el 9 de febrero de 2020. «The nominal track gauge on the rail network 1,524 mm. The max tolerance range in lowest quality lines (class 6, max speed 50 km/h) is −7…+20 mm».
