1. Bazeley, P.: Computer-assisted integration of mixed methods data sources and analyses. In: Tashakkori, A., Teddlie, C. (eds.) Sage Handbook of Mixed Methods in Social and Behavioral Research, pp. 431–467. SAGE, Thousand Oaks (2010)
2. Bergman, M.M.: The good, the bad, and the ugly in mixed methods research and design. J. Mixed Methods Res. 5, 271–275 (2011)
3. Bericat Alastuey, E.: La integración de los métodos cuantitativo y cualitativo en la investigación social. Significado y medida. Ariel, Barcelona (1999)
4. Bruyn, S.T.H.: The Human Perspective in Sociology: The Methodology of Participant Observation. Prentice-Hall, Englewood Cliffs (1966)
5. Cohen, L., Manion, L., Morrison, K.: Research Methods in Education, 8th edn. Routledge, Milton, Oxfordshire (2018)