9H. B. Morse, The Chronicles of the East India Company Trading to China 1635 - 1834, Oxford, Harvard University Press, Clarendon Press, 1926- 1929, vol. 5, pp. 30, 31.
10H. B. Morse, The Chronicles of the East India Company Trading to China 1635 - 1834, Oxford, Harvard University Press, Clarendon Press, 1926- 1929, vol. 4, pp.171-172.