Robert Murray M'Cheyne, Andrew Alexander Bonar (1852). “Memoir and remains of the rev. Robert Murray M'Cheyne, minister of St. Peter's church, Dundee”, p.236
Robert Murray M'Cheyne, Andrew Alexander Bonar (1852). “Memoir and remains of the rev. Robert Murray M'Cheyne, minister of St. Peter's church, Dundee”, p.344