This photo has been published in Karl Pearson, The Life, Letters, and Labours of Francis Galton (1914). Authors: Henry Maull (1829–1914) and John Fox (1832–1907) (Maull & Fox)
"The Photographic Message", trans. Stephen Heath, chap. in [http://monoskop.org/log/?p=413 ''Image-Music-Text''], essays, New York: Hill and Wang, 1977 (Reprint in: ''A Barthes Reader'', ed. Susan Sontag, New York: Hill and Wang, 1982: 194-210).
Becker, Howard S.(1995) 'Visual sociology, documentary photography, and photojournalism: It's (almost) all a matter of context', Visual Studies, 10: 1, 5 — 14.