アンケートや取材の依頼分
https://jp.creativesurvey.com/blog/posts/requestletter-20221125/
https://digi-co.net/blog/questionnaire-request-text/
https://magazine.techacademy.jp/magazine/21004
リサーチ代行
https://i-staff.jp/blog/research-outsourcing/
https://www.tsr-net.co.jp/company/questionnaire/index.html
市場調査 一般論
https://osirabe.com/market-research/
定性調査
https://chat-interview.com/blog/articles/qualitative-research-summary.html