↑ Kotschick, Dieter (2006). “The Topology and Combinatorics of Soccer Balls: When Mathematicians Think about Soccer Balls, the Number of Possible Designs Quickly Multiplies”. American Scientist 94 (4): 350–357. ||ngày truy cập= cần |url= (trợ giúp)
↑ Hong, Sungchan; Asai, Takeshi (ngày 29 tháng 5 năm 2014). “Effect of panel shape of soccer ball on its flight characteristics”. Scientific Reports 4 (1). doi:10.1038/srep05068. ||ngày truy cập= cần |url= (trợ giúp)
↑ Price, D. S., Jones, R.Harland, A. R. 2006. Computational modeling of manually stitched footballs. Proceedings of the Institution of Mechanical Engineers – Part L — Journal of Materials: Design & Applications. Vol. 220 Issue 4, p259-268.
