https://www.kitkat.com/kitkat-history
https://nestle.jp/kitkat/?fbclid=PAZXh0bgNhZW0CMTEAAaYM3DFMiomZ5UyDMiCPL-DZ2JuBBdNMn0OB9_fTGAYQgVkkQoOpBwJOvq0_aem_y7KviaQDqzsObYZ-WkzuiQ
https://www.news1.kr/industry/general-industry/5677456
https://view.asiae.co.kr/article/2024082010253802895
https://sports.donga.com/article/all/20231126/122355438/1
https://news.einfomax.co.kr/news/articleView.html?idxno=94498
https://sports.donga.com/article/all/20161102/81138832/3