1. China’s Mobile Payments Market Grows Over 15% in Q3 2019, Ali Pay’s Market Share Exceed Halfhttp://www.chinabankingnews.com/2020/01/21/chinas-mobile-payments-market-grows-over-15-alipays-market-share-exceed-half/
2. WeChat Claims 1.08 Billion Users in Latest “One Minute” Data Reporthttps://technode.com/2018/11/19/wechat-1-minute-statistics-report/
3. Use and gratifications of mobile SNSs: Facebook and KakaoTalk in Korea
4. Kakao Pay Passes 20 Trillion Won Transaction Mark for 2018https://www.zdnet.com/article/kakao-pay-passes-20-trillion-won-transaction-mark-for-2018/#ftag=RSSbaffb68
5. Kakao Pay Starts Payment Service on Google Play, YouTube Premiumhttp://www.koreaherald.com/view.php?ud=20191211000561