The industrial revolution /
Humphreys, M. E. Beggs(Mary Eleanor Beggs)
Gregor, Hugh.
Humphreys, Darlow Willis.
London : Routledge,
2006, c1959.
Facsim. reprint of 3rd ed. originally published: London : George Allen & Unwin, 1976.
Bibliography:  p. 48-[49]