(Possibly) G. P. Bellori, Le vite de' pittori scultori ed architetti moderni, 1675-1695, ed. E. Borea, Turin, 1976, p. 585. G. Knapton, Catalogue of the Pictures at Althorpe and Wimbeldon belonging to the late Honorable Mr. Spencer, 25 October 1746, no. 298, in 'The Picture Clossett', 'The flight into Egypt by Carlo Moratto'. A Catalogue of the pictures at Althorp taken in the year 1750, in 'The Picture Closet', 'Our Saviour, The Virgin & St. Christopher by Carl: Maratt.'. H. Walpole, ms. notebook of 1759, published as "Horace Walpole's Journals of Visits to Country Seats" trans. and ed. P. Toynbee in The Walpole Society, Oxford, 1927-1928, XVI, p. 31, 'Virgin giving Child to St. Christopher over a river, small from the large one at Rome, but qu: if of Carlo Maratti'. F. T. Dibdin, Aedes Althorpianae: or an account of the mansion, books, and pictures, at Althorp, the residence of George John Earl Spencer, to which is added a supplement of the Bibliotheca Spenceriana, London, 1822, p. 30. D. Morton, Catalogue of the Pictures at Althorp House, in the county of Northampton: with occasional notices, biographical or historical, privately printed, 1851. K. J. Garlick, 'A Catalogue of Pictures at Althorp', in The Walpole Society, XLV, 1976, p. 57, no. 438. S. Rudolph in E. Borea and C. Gasparri, ed., L'idea del Bello: Viaggio per Roma nel Seicento con Giovan Pietro Bellori, exhibition catalogue, Rome, 2000, II, p. 462, under no. 5. S. Rudolph, "I dipinti eseguiti da Carlo Maratti nel 1663-1664 per la cappella del Voto nel Duomo" in Le Pitture del Duomo di Siena, Cinisello Balsamo, 2008, p. 51.