Research design qualitative, quantitative, and mixed methods approaches par Creswell, John W., Creswell, J. David

100 questions (and answers) about research ethics par Anderson, Emily E., Corneli, Amy

Investigative research theory and practice par Layder, Derek

Designing and conducting mixed methods research par Creswell, John W., Plano Clark, Vicki L.

A concise introduction to mixed methods research par Creswell, John W.

Automated data collection with R a practical guide to Web scraping and text mining par Munzert, Simon

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Web survey methodology par Callegaro, Mario, Lozar Manfreda, Katja, Vehovar, Vasja

Focus groups theory and practice par Stewart, David W., Shamdasani, Prem N.

Managing and sharing research data a guide to good practice par Corti, Louise, Eynden, Veerle van den, Bishop, Libby, Woollard, Matthew

Qualitative methodology a practical guide