MyLearning

https://www.simplilearn.com/data-analysis-methods-process-types-article

Content analysis https://researchmethod.net/content-analysis/

Chapter 17. Content Analysis

From Oregon State University

How to do content analysis https://www.scribbr.com/methodology/content-analysis/

Case studies

https://www.teachingenglish.org.uk/publications/case-studies-insights-and-research