Inuzuka, Takaaki; Laurie, Haruko (2021). "The Choshu Five". In Inuzuka, Takaaki (ed.). Alexander Williamson : A Victorian chemist and the making of modern Japan. London: UCL Press. pp. 28–51. doi:10.2307/j.ctv1fj84dv.8. ISBN978-1-78735-934-5. OCLC1253032904.
Inuzuka, Takaaki; Laurie, Haruko (2021). "The Choshu Five". In Inuzuka, Takaaki (ed.). Alexander Williamson : A Victorian chemist and the making of modern Japan. London: UCL Press. pp. 28–51. doi:10.2307/j.ctv1fj84dv.8. ISBN978-1-78735-934-5. OCLC1253032904.