L/PJ/12/500, India Office Records, Asian and African Studies Reading Room, British Library, St Pancras
L/PJ/12/637, India Office Records, Asian and African Studies Reading Room, British Library, St Pancras
L/PJ/7/1715, India Office Records, Asian and African Studies Reading Room, British Library, St Pancras
Mss Eur C826 1940 Copy of transcript of proceedings in the trial, on 4 Jun 1940, of Udham Singh for the murder of Sir Michael Francis O'Dwyer (1864-1940), Lieutenant-Governor of the Punjab 1913-19, Asian and African Studies Reading Room, British Library, St Pancras
MEPO 3/1743 Murder of Sir Michael Francis O'Dwyer by Udham Singh at Caxton Hall, Westminster, on 13 March, 1940, National Archives, Kew, UK
PCOM 9/872, National Archives, Kew, UK
P&J (s) 466/36, National Archives, Kew, UK