A sermon preached in the parish-church of Christ-Church, London, on Thursday May the 20th, 1779: being the time of the yearly meeting of the children educated in the charity-schools, in and about the cities of London and Westminster. By the Reverend Robert Markham, ... To which is annexed, An account of the Society for promoting Christian Knowledge. - Markham, Robert, (printed by W. Oliver; and sold by John, Francis and Charles Rivington,, 1779)