1. FIFA. FIFA WORLD CUP QATAR 2022™ IN NUMBERS 2023. https://publications.fifa.com/en/annual-report-2022/tournaments-and-events/fifa-world-cup-quatar-2022/fifa-world-cup-qatar-2022-in-numbers. Accessed 10 Aug 2023.
2. FIFA. Five substitutes option temporarily allowed for competition organisers 2020. https://www.fifa.com/media-releases/five-substitutes-option-temporarily-allowed-for-competition-organisers. Accessed 10 Aug 2023.
3. IFAB. The IFAB permanently approves five-substitute option in top-level competitions 2022. https://www.theifab.com/news/the-ifab-permanently-approves-five-substitute-option-in-top-level-competitions. Accessed 10 Aug 2023.
4. IFAB. 4th Substitute in Extra Time Experimental Study Protocol 2016. https://www.uefa.com/MultimediaFiles/Download/uefaorg/General/02/47/85/97/2478597_DOWNLOAD.pdf. Accessed 6 Aug 2024.
5. IFAB. CONCUSSION SUBSTITUTES 2020. https://www.theifab.com/laws/latest/concussion-substitutes. Accessed 10 Aug 2023.