Bourke, Joanna (1 January 1996). "The Great Male Renunciation: Men's Dress Reform in Inter-war Britain". Journal of Design History. 9 (1): 23–33. doi:10.1093/jdh/9.1.23.
oxforddnb.com
Graham Richards, 'Flügel, John Carl (1884–1955)', Oxford Dictionary of National Biography, 2004 [1]