Paul, James Balfour. “Notes (1) on a Set of Shuffle-Board Counters With Portraits of Kings and Heraldic Devices, about 1640; (2) on a Silver Badge of the Conservator of Scottish Privileges in the Netherlands - Exhibited by Sir Robert Fraser Turing, Bart”. Proceedings of the Society of Antiquaries of Scotland, vol. 25, Nov. 1891, pp. 397-02, doi:10.9750/PSAS.025.397.402.