Original Letters from James Gregorie, Professor of Mathematics in the University of St Andrews, to the Reverend Colin Campbell, Minister of Ardchattan, Argyleshire. Archaeologia Scotica, [S. l.], v. 3, p. 275–284, 1832. Disponível em: https://soas-test.journals.ed.ac.uk/index.php/arch-scot/article/view/231. Acesso em: 5 nov. 2025.