See: Schaaf, H. Fox Talbot's The Pencil of Nature, Anniversary Facsimile, Introductory volume, p. 48 and No. 1, plate IV;
see: Roberts, "Specimens and Marvels: William Henry Fox Talbot The Invention of Photography" in Aperture, no. 161, p. 49;
see: Schaaf, The Photographic Art of William Henry Fox Talbot, pp. 192-3; Heiting, At the Still Point, Photographs from the Manfred Heiting Collection, vol. I, 1840-1916, pl. 8.