Berikut referensi artikel-artikel yang penulis peroleh ketika mencari cara penyelesaian CSRF dan AJAX dalam framework CodeIgniter:

http://www.ferycode.com/blog/codeigniter/pengaturan-csrf-protection-codeigniter-3-0.html

http://www.johnkieken.com/when-codeigniters-csrf-protection-breaks-your-ajax/

https://jerel.co/blog/2012/03/a-simple-solution-to-codeigniter-csrf-protection-and-ajax

https://ericlbarnes.com/2011/03/17/codeigniter-csrf-protection-with-ajax/

https://stackoverflow.com/questions/29903517/how-to-make-ajax-work-when-csrf-regeneration-is-true-in-codeigniter3