1. Board of Trade. (1928a). BT 215/1223, Indian Tea Association (London) and others: Application for marking of imports. The National Archives.
2. Board of Trade. (1928b). BT 215/1232, Mr Barnes (member of standing committee): Comments. The National Archives.
3. Indian Tea Association. (1928a). Mss F174/1089, Merchandise Marks Act 1926: Correspondence and papers concerning application for a marking Order. British Library.
4. Indian Tea Association. (1928b). Mss Eur 174/1090, Merchandise Marks Act 1926: Correspondence and papers concerning application for a marking Order. British Library.
5. Tea Buyers’ Association. (1924–1926). CLC/B/150/MS16755/14. Tea Buyers’ Association.