Robert Murray M'Cheyne (1847). “Additional Remains of the Rev. Robert Murray M'Cheyne, Late Minister of St. Peter's Church, Dundee: Consisting of Various Sermons and Lectures Delivered by Him in the Course of His Ministry”, p.470
Joseph Lancaster (1807). “Improvements in Education, as it Respects the Industrious Classes of the Community: Containing Among Other Important Particulars, an Account of the Institution for the Education of One Thousand Poor Children, Borough Road, Southwark; and of the New System of Education on which it is Conducted”, p.151