1. Hong Kong: Public Records Office.Correspondences with the Colonial Office: Document No. CO 129.358.40136, Opium Farm (11 December 1909)
2. Hong Kong: Public Records Office.Correspondences with the Colonial Office: Document No. CO 129.499.2. China, Canton Situation (various years and dates)
3. Hong Kong: Public Records Office.Correspondences with the Colonial Office: Document No. CO 129.510.10. Loan to Canton Provincial Government by H.K. Government (various years and dates)
4. China Mail. 20 March 1950. 20 March, Hong Kong
5. Hong Kong Telegraph. 17 February 1938. 17 February, Hong Kong