1. (1) Total number of Websites: https://www.internetlivestats.com/total-number-of-websites/ (2022-01-27)
2. (2) 泉 浩人：競争戦略としてのユーザーエクスペリエンスデザイン：「買い手市場」を勝ち抜くためのヒント，情報管理，Vol. 59, No. 8, pp. 535-543 (2016)
3. (3) Jakob Nielsen: https://www.nngroup.com/articles/ten-usability-heuristics/ (2022-01-27)
4. (4) Ben Shneiderman: https://www.cs.umd.edu/users/ben/goldenrules.html (2022-01-27)
5. (5) ISO 9241-210: 2019: Ergonomics of human-system interaction-Part 210: Human-centred design for interactive systems (2019)