Stearn, Roger T. (2004). "Simpson, Sir John Hope (1868–1961)". Oxford Dictionary of National Biography (online, January 2012 ed.). Oxford University Press. Archived from the original on 14 September 2016. Retrieved 12 June 2017.
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Stearn, Roger T. (2004). "Simpson, Sir John Hope (1868–1961)". Oxford Dictionary of National Biography (online, January 2012 ed.). Oxford University Press. Archived from the original on 14 September 2016. Retrieved 12 June 2017.