Clarke, Alexander Ross (1 January 1867). "X. Abstract of the results of the comparisons of the standards of length of England, France, Belgium, Prussia, Russia, India, Australia, made at the ordnance Survey Office, Southampton". Philosophical Transactions of the Royal Society of London. 157: 161–180. doi:10.1098/rstl.1867.0010. ISSN0261-0523. S2CID109333769.
Clarke, Alexander Ross (1 January 1867). "X. Abstract of the results of the comparisons of the standards of length of England, France, Belgium, Prussia, Russia, India, Australia, made at the ordnance Survey Office, Southampton". Philosophical Transactions of the Royal Society of London. 157: 161–180. doi:10.1098/rstl.1867.0010. ISSN0261-0523. S2CID109333769.
Lord, John (2001), "Spread of the Metric System", Sizes: The Online Quantinary, Santa Monica: Sizes Inc, archived from the original on 19 January 2019, retrieved 6 June 2017.
Lord, John (2001), "Spread of the Metric System", Sizes: The Online Quantinary, Santa Monica: Sizes Inc, archived from the original on 19 January 2019, retrieved 6 June 2017.
Clarke, Alexander Ross (1 January 1867). "X. Abstract of the results of the comparisons of the standards of length of England, France, Belgium, Prussia, Russia, India, Australia, made at the ordnance Survey Office, Southampton". Philosophical Transactions of the Royal Society of London. 157: 161–180. doi:10.1098/rstl.1867.0010. ISSN0261-0523. S2CID109333769.