^Tindley, Annie; Wodehouse, Andrew (2016). "Conceptual Development–The Embodied Empire". Design, Technology and Communication in the British Empire, 1830–1914. Palgrave Macmillan UK. p. 76.
^Tindley, Annie; Wodehouse, Andrew (2016). "Conceptual Development–The Embodied Empire". Design, Technology and Communication in the British Empire, 1830–1914. Palgrave Macmillan UK. p. 76.