"Constable". Book by Leslie Parris and Ian Fleming-Williams, Tate Gallery Publications, London, p. 380, Letter to William Purton (6 February 1836), 1993.
Marcel Proust's preface (1910) to John Ruskin "The Bible of Amiens" translated by Marcel Proust (1904); later quoted in "Marcel Proust: On Reading Ruskin" translated by Jean Autret and Philip J. Wolfe (p. 57), 1987.
"'Lagos shows how a city can recover from a deep, deep pit': Rem Koolhaas talks to Kunlé Adeyemi". Interview with Chris Michael, www.theguardian.com. February 26, 2016.