'The Great Cannon of Muhammad II (AD 1464)...'
Pamphlet: 'The Great Cannon of Muhammad II (AD 1464) recently presented to the British Government by the Sultan and now in the Museum of Artillery, Woolwich', (substance of a memoir read before the Archaeological Institute, 3 June 1868), Maj-Gen J H Lefroy, includes letter, 1889 and clipping, 5 April 1894