"Sock History". archive of www.lonelysock.com. Archived from the original on 2016-09-29.{{cite web}}: CS1 maint: bot: original URL status unknown (link)
Herring, Kirk (2010). "Running footwear: triathlon and duathlon". In Ward, Matthew B.; Knight, E. Leslie; Langer, Paul R. (eds.). Athletic Footwear and Orthoses in Sports Medicine. Springer. pp. 223–256. OCLC640142234.