1. https://housing.yale.edu/sites/default/files/webform/free-vbucks-generator-fortnite.pdf
2. https://www.desu.edu/system/files/webform/4026/v-bucks-generator-no-verify.pdf
3. https://zenodo.org/record/3874058
4. https://www.smartsurvey.co.uk/s/E0WEAP/
5. https://townsendsociety.org/forum/index.php?action=profile;u=13285
6. http://www.thecenterfoundation.org/member/8436
7. http://wiki.ndf.taklia.com/index.php?title=User:YoshiVIs
8. http://oja.rtarf.mi.th/webboard/index.php?action=profile;u=88800
9. http://memberforums.roleplayevolution.com/laramie/index.php?action=profile;u=436595
10. https://asta.uni-saarland.de/wiki/index.php?title=Benutzer:JenniferLadam
11. https://wiki.framealbum.com/index.php/User:JohnMcCoy
12. http://apejd.ch/wiki/index.php?title=Utilisateur:AbigailJohnson
13. http://memberforums.roleplayevolution.com/laramie/index.php?action=profile;u=436595
14. https://wikiground.org/footprint/User:StellaInone
15. https://www.monsterhunterworld.wiki/User:JohanMadman
16. http://132.145.113.133/index.php/User:GabrielaSpanduk
17. https://wiki.flo.cash/index.php/User:BirulMadona
18. http://www.roovet.com/articles/User:JakeMurona
19. https://marina-pedia.eu/w/index.php?title=User:BalgainNoma
20. http://www.ffxiv-wiki.com/index.php?title=User:BabangManaf