^Atherton, Martin (2020). "Association of Football Statisticians". In Russell, Dave; Cox, Richard; Vamplew, Wray (eds.). Encyclopedia of British Football. Taylor & Francis. ISBN9781000144147.
^Palacios-Huerta, Ignacio (2004). "Structural changes during a century of the world's most popular sport". Statistical Methods and Applications. 13 (2): 241–258. doi:10.1007/s10260-004-0093-3.