"World Cup 1938 finals". Archived from the original on 3 May 2006. Retrieved 7 January 2016.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
Wilson, Jonathan (14 August 2018). Inverting the pyramid : the history of soccer tactics (Second trade paperback ed.). New York, NY. ISBN9781568589190. OCLC1024085926.{{cite book}}: CS1 maint: location missing publisher (link)