Macadam, W Ivison. “Notice, With Analyses, of a Series of Church Tokens of Various Parishes; of the Collection Plates Belonging to the Church of Duddingston and the Trinity College Church of Edinburgh; And of the Trinity College Church Hospital Bell”. Proceedings of the Society of Antiquaries of Scotland, vol. 14, Nov. 1880, pp. 163-9, doi:10.9750/PSAS.014.163.169.