"Soap Advertising – the trader as civilizer and the scramble for Africa", in Imperial persuaders: images of Africa and Asia in British advertising, Anandi Ramamurthy, Manchester University Press, 2003, ch. 2, pp. 24–62
britishmuseum.org
There is a copy in the British Museum which can be viewed online
elegiacus.blogspot.com
Gibbs, Laura (2009-06-20). "Emblem 59". Elegiacus.blogspot.com. Retrieved 2014-01-02.
findarticles.com
"19th century AD", H.L. Malchow, Past & Present May 1993 pp. 7–8